MC39i Atc V0102

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MC39i
Siemens Cellular Engine
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DocID:

01.02
MC39i_ATC_V01.02

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MC39i AT Command Set

mo b i l e

Confidential / Released

Document Name:

MC39i AT Command Set

Version:

01.02

Date:

November 11, 2003

DocId:

MC39i_ATC_V01.02

Status:

Confidential / Released

General Notes
Product is deemed accepted by recipient and is provided without interface to recipient’s products. The
documentation and/or product are provided for testing, evaluation, integration and information purposes. The documentation and/or product are provided on an “as is” basis only and may contain deficiencies or inadequacies. The documentation and/or product are provided without warranty of any
kind, express or implied. To the maximum extent permitted by applicable law, Siemens further disclaims all warranties, including without limitation any implied warranties of merchantability, completeness, fitness for a particular purpose and non-infringement of third-party rights. The entire risk arising
out of the use or performance of the product and documentation remains with recipient. This product is
not intended for use in life support appliances, devices or systems where a malfunction of the product
can reasonably be expected to result in personal injury. Applications incorporating the described product must be designed to be in accordance with the technical specifications provided in these guidelines. Failure to comply with any of the required procedures can result in malfunctions or serious discrepancies in results. Furthermore, all safety instructions regarding the use of mobile technical systems, including GSM products, which also apply to cellular phones must be followed. Siemens or its
suppliers shall, regardless of any legal theory upon which the claim is based, not be liable for any consequential, incidental, direct, indirect, punitive or other damages whatsoever (including, without limitation, damages for loss of business profits, business interruption, loss of business information or data,
or other pecuniary loss) arising out the use of or inability to use the documentation and/or product,
even if Siemens has been advised of the possibility of such damages. The foregoing limitations of liability shall not apply in case of mandatory liability, e.g. under the German Product Liability Act, in
case of intent, gross negligence, injury of life, body or health, or breach of a condition which goes to
the root of the contract. However, claims for damages arising from a breach of a condition, which goes
to the root of the contract, shall be limited to the foreseeable damage, which is intrinsic to the contract,
unless caused by intent or gross negligence or based on liability for injury of life, body or health. The
above provision does not imply a change on the burden of proof to the detriment of the recipient. Subject to change without notice at any time. The interpretation of this general note shall be governed and
construed according to German law without reference to any other substantive law.
Copyright
Transmittal, reproduction, dissemination and/or editing of this document as well as utilization of its
contents and communication thereof to others without express authorization are prohibited. Offenders
will be held liable for payment of damages. All rights created by patent grant or registration of a utility
model or design patent are reserved.
Copyright © Siemens AG 2003

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Contents
1

Introduction ...................................................................................................9

1.1
1.2
1.3
1.4
1.4.1
1.4.2
1.4.3
1.4.4
1.4.5
1.5
1.5.1
1.6
1.6.1
1.6.2

Scope of the document .............................................................................................................9
Related documents ...................................................................................................................9
Conventions and abbreviations...............................................................................................10
AT command syntax ...............................................................................................................10
Using parameters....................................................................................................................10
Combining AT commands on the same command line ..........................................................11
Entering successive AT commands on separate lines ...........................................................11
Communication between customer application and MC39i....................................................11
Unsolicited Result Codes (URCs)...........................................................................................12
Supported character sets ........................................................................................................13
UCS2 and GSM data coding and conversion in SMS text mode and Remote-SAT...............14
Flow control .............................................................................................................................17
Software flow control (XON/OFF flow control) ........................................................................17
Hardware flow control (RTS/CTS flow control) .......................................................................17

2

Standard V.25ter AT Commands ...............................................................18

2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.10
2.11
2.12
2.13
2.14
2.15
2.16
2.17
2.18
2.19
2.20
2.21
2.22
2.23
2.24
2.25
2.26
2.27
2.28
2.29
2.30
2.31
2.32
2.33
2.34
2.35
2.36
2.37

A/ Repeat previous command line .........................................................................................18
+++ Switch from data mode or PPP online mode to command mode...................................18
AT\Qn Flow control ................................................................................................................19
ATA Answer a call..................................................................................................................20
ATD Mobile originated call to dial a number ..........................................................................21
ATD> Originate call to phone number  in memory  ..........................24
ATD> Originate call to phone number selected from active memory ..............................26
ATD> Originate call to phone number in memory with corresponding field ..................27
ATDI Mobile originated call to dialable ISDN number  ....................................................28
ATDL Redial last telephone number used .............................................................................29
ATE Enable command echo ..................................................................................................30
ATH Disconnect existing connection .....................................................................................30
ATI Display product identification information........................................................................31
ATI[value] Display additional identification information..........................................................31
ATL Set monitor speaker loudness........................................................................................32
ATM Set monitor speaker mode ............................................................................................32
ATO Switch from command mode to data mode / PPP online mode....................................32
ATQ Set result code presentation mode................................................................................33
ATP Select pulse dialing ........................................................................................................33
ATS0 Set number of rings before automatically answering the call ......................................33
ATS3 Write command line termination character ..................................................................34
ATS4 Set response formatting character...............................................................................34
ATS5 Write command line editing character..........................................................................34
ATS6 Set pause before blind dialing......................................................................................35
ATS7 Set number of seconds to wait for connection completion ..........................................35
ATS8 Set number of seconds to wait for comma dial modifier ..............................................35
ATS10 Set disconnect delay after indicating the absence of data carrier .............................36
ATS18 Extended error report.................................................................................................37
ATT Select tone dialing ..........................................................................................................38
ATV Set result code format mode..........................................................................................39
ATX Set CONNECT result code format and call monitoring..................................................39
ATZ Set all current parameters to user defined profile ..........................................................40
AT&C Set circuit Data Carrier Detect (DCD) function mode..................................................40
AT&D Set circuit Data Terminal Ready (DTR) function mode ...............................................41
AT&F Set all current parameters to manufacturer defaults ...................................................42
AT&S Set circuit Data Set Ready (DSR) function mode........................................................44
AT&V Display current configuration .......................................................................................45

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2.38
2.39
2.40
2.41
2.42
2.43
2.44
2.45
2.45.1

AT&W Store current configuration to user defined profile .....................................................47
AT+GCAP Request complete TA capabilities list ..................................................................49
AT+GMI Request manufacturer identification........................................................................49
AT+GMM Request TA model identification............................................................................49
AT+GMR Request TA revision identification of software status ............................................50
AT+GSN Request TA serial number identification (IMEI)......................................................50
AT+ILRR Set TE-TA local rate reporting ................................................................................51
AT+IPR Set fixed local rate.....................................................................................................52
Autobauding ............................................................................................................................53

3

AT Commands for FAX...............................................................................54

3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
3.12
3.13
3.14
3.15
3.16
3.17
3.18
3.19
3.20
3.21
3.22
3.23
3.24
3.25
3.26
3.27

AT+FBADLIN Bad Line Threshold .........................................................................................55
AT+FBADMUL Error Threshold Multiplier..............................................................................55
AT+FBOR Query data bit order .............................................................................................56
AT+FCIG Query or set the Local polling id ............................................................................57
AT+FCLASS Fax: Select, read or test service class .............................................................58
AT+FCQ Copy Quality Checking ...........................................................................................59
AT+FCR Capability to receive................................................................................................59
AT+FDCC Query or set capabilities.......................................................................................60
AT+FDFFC Data Compression Format Conversion ..............................................................61
AT+FDIS Query or set session parameters...........................................................................62
AT+FDR Begin or continue phase C data reception..............................................................63
AT+FDT Data Transmission ..................................................................................................63
AT+FET End a page or document .........................................................................................64
AT+FK Kill operation, orderly FAX abort................................................................................64
AT+FLID Query or set the Local Id setting capabilities .........................................................64
AT+FMDL Identify Product Model..........................................................................................65
AT+FMFR Request Manufacturer Identification ....................................................................65
AT+FOPT Set bit order independently...................................................................................65
AT+FPHCTO DTE Phase C Response Timeout ...................................................................66
AT+FREV Identify Product Revision ......................................................................................66
AT+FRH Receive Data Using HDLC Framing .......................................................................66
AT+FRM Receive Data ..........................................................................................................67
AT+FRS Receive Silence ......................................................................................................67
AT+FTH Transmit Data Using HDLC Framing ......................................................................67
AT+FTM Transmit Data .........................................................................................................68
AT+FTS Stop Transmission and Wait ...................................................................................68
AT+FVRFC Vertical resolution format conversion .................................................................69

4

AT Commands originating from GSM 07.07 .............................................70

4.1
4.2
4.3
4.4
4.5
4.6
4.6.1
4.7
4.8
4.9
4.10
4.11
4.11.1
4.12
4.13
4.14
4.15
4.16

AT+CACM Accumulated call meter (ACM) reset or query ....................................................70
AT+CALA Set alarm time.......................................................................................................71
AT+CAMM Accumulated call meter maximum (ACMmax) set or query................................74
AT+CAOC Advice of Charge information ..............................................................................75
AT+CBST Select bearer service type ....................................................................................76
AT+CCFC Call forwarding number and conditions control....................................................77
Examples: Call forwarding ......................................................................................................79
AT+CCLK Real Time Clock ...................................................................................................81
AT+CCUG: Closed User Group ..............................................................................................82
AT+CCWA Call waiting ..........................................................................................................83
AT+CEER Extended error report ...........................................................................................86
AT+CFUN Set phone functionality .........................................................................................88
Wake up the ME from SLEEP mode.......................................................................................91
AT+CGMI Request manufacturer identification ......................................................................92
AT+CGMM Request model identification...............................................................................92
AT+CGMR Request revision identification of software status ...............................................92
AT+CGSN Request product serial number identification (IMEI) identical to GSN ................93
AT+CHLD Call hold and multiparty .........................................................................................94

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4.17
4.18
4.19
4.20
4.21
4.21.1
4.21.2
4.21.3
4.22
4.23
4.24
4.25
4.26
4.27
4.28
4.28.1
4.29
4.30
4.31
4.32
4.33
4.34
4.35
4.35.1
4.36
4.37
4.38
4.39
4.40
4.41
4.42
4.43
4.44
4.45
4.46
4.47
4.48
4.49
4.50
4.51

AT+CHUP Hang up call .........................................................................................................97
AT+CIMI Request international mobile subscriber identity....................................................97
AT+CIND Indicator control ......................................................................................................98
AT+CLCC List current calls of ME .......................................................................................101
AT+CLCK Facility lock .........................................................................................................103
Examples: Enabling / disabling PIN 1 authentication ...........................................................106
Examples: Phone lock...........................................................................................................107
Examples: Call barring ..........................................................................................................109
AT+CLIP Calling line identification presentation..................................................................110
AT+CLIR Calling line identification restriction......................................................................111
AT+CLVL Loudspeaker volume level ..................................................................................112
AT+CMEE Report mobile equipment error ..........................................................................113
AT+CMER Mobile equipment event reporting .....................................................................114
AT+CMUT Mute control .......................................................................................................116
AT+CMUX Enter multiplex mode .........................................................................................117
Restricted use of AT commands in Multiplex mode..............................................................118
AT+COPN Read operator names ........................................................................................120
AT+COPS Operator selection..............................................................................................121
AT+CPAS Mobile equipment activity status ........................................................................124
AT+CPBR Read current phonebook entries........................................................................125
AT+CPBS Select phonebook memory storage....................................................................127
AT+CPBW Write phonebook entry ......................................................................................129
AT+CPIN Enter PIN .............................................................................................................132
What to do if PIN or password authentication fails? .............................................................135
AT+CPIN2 Enter PIN2 .........................................................................................................137
AT+CPUC Price per unit and currency table .......................................................................138
AT+CPWD Change password .............................................................................................140
AT+CR Service reporting control .........................................................................................143
AT+CRC Set Cellular Result Codes for incoming call indication.........................................144
AT+CREG Network registration ...........................................................................................145
AT+CRLP Select radio link protocol param. for orig. non-transparent data call ..................148
AT+CRSM Restricted SIM access .......................................................................................149
AT+CSCS Set TE character set...........................................................................................151
AT+CSNS Single Numbering Scheme ................................................................................152
AT+CSQ Signal quality ........................................................................................................153
AT+CSSN Supplementary service notifications...................................................................154
AT+CUSD Unstructured supplementary service data .........................................................155
AT+VTD= Tone duration................................................................................................156
AT+VTS DTMF and tone generation ( in {0-9, *, #, A, B, C, D}) .............................157
AT+WS46 Select wireless network .......................................................................................158

5

AT commands originating from GSM 07.05 for SMS .............................159

5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
5.11
5.12
5.13
5.14
5.15
5.16

AT+CMGC Send an SMS command ...................................................................................159
AT+CMGD Delete SMS message........................................................................................160
AT+CMGF Select SMS message format .............................................................................160
AT+CMGL List SMS messages from preferred store ..........................................................161
AT+CMGR Read SMS message .........................................................................................164
AT+CMGS Send SMS message..........................................................................................167
AT+CMGW Write SMS message to memory.......................................................................169
AT+CMSS Send SMS message from storage.....................................................................171
AT+CNMA New SMS message acknowledge to ME/TE, only phase 2+ ............................172
AT+CNMI New SMS message indications ..........................................................................173
AT+CPMS Preferred SMS message storage ......................................................................176
AT+CSCA SMS service centre address ..............................................................................178
AT+CSCB Select cell broadcast messages.........................................................................179
AT+CSDH Show SMS text mode parameters .....................................................................180
AT+CSMP Set SMS text mode parameters.........................................................................181
AT+CSMS Select Message Service ....................................................................................182

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6

GPRS AT commands ................................................................................183

6.1
6.1.1
6.1.2
6.1.3
6.1.4
6.1.5
6.1.6
6.1.7
6.1.8
6.1.9
6.2
6.2.1
6.2.2
6.2.3
6.3
6.3.1
6.3.2
6.3.3
6.4
6.5

GPRS AT commands in accordance with GSM 07.07 .........................................................183
AT+CGACT PDP context activate or deactivate..................................................................183
AT+CGATT GPRS attach and detach .................................................................................185
AT+CGDATA Enter data state .............................................................................................186
AT+CGDCONT Define PDP Context ...................................................................................188
AT+CGPADDR Show PDP address .....................................................................................190
AT+CGQMIN Quality of Service Profile (Minimum acceptable) ..........................................191
AT+CGQREQ Quality of Service Profile (Requested) .........................................................195
AT+CGREG GPRS network registration status....................................................................199
AT+CGSMS Select service for MO SMS messages ...........................................................200
Siemens defined GPRS AT commands................................................................................201
AT^SGACT Query all PDP context activations.....................................................................201
AT^SGAUTH Set type of authentication for PPP connection .............................................202
AT^SGCONF Configuration of GPRS related Parameters ...................................................203
Modem compatibility commands for MTs supporting GPRS ................................................204
ATD *99# Request GPRS service .......................................................................................204
ATD *98# Request GPRS IP service ..................................................................................205
ATH Manual rejection of a network request for PDP context activation ..............................206
Using GPRS AT commands (examples)...............................................................................207
Using the GPRS dial command ATD ....................................................................................209

7

AT Commands for SIM Application Toolkit (GSM 11.14).......................210

7.1
7.2
7.3
7.4

AT^SSTA Remote-SAT Interface Activation.........................................................................211
^SSTN Remote-SAT Notification ..........................................................................................212
AT^SSTGI Remote-SAT Get Information .............................................................................213
AT^SSTR Remote-SAT Response .......................................................................................214

8

Siemens defined AT commands for enhanced functions .....................215

8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
8.10
8.10.1
8.11
8.12
8.13
8.14
8.15
8.16
8.17
8.18
8.19
8.20
8.21
8.22
8.23
8.24
8.25
8.26
8.27

AT+CXXCID Display card ID (identical to AT^SCID)...........................................................215
AT^MONI Monitor idle mode and dedicated mode ..............................................................216
AT^MONP Monitor neighbour cells......................................................................................219
AT^SACM Advice of charge and query of ACM and ACMmax ...........................................220
AT^SAIC Audio Interface Configuration..............................................................................221
AT^SBC Battery charge and charger control .......................................................................222
AT^SCID Display SIM card identification number................................................................223
AT^SCKS Query SIM and chip card holder status ..............................................................224
AT^SCNI List Call Number Information ...............................................................................226
AT^SCTM Set critical operating temperature presentation mode or query temperature.....227
Deferred shutdown................................................................................................................229
AT^SDLD Delete the “last number redial“ memory..............................................................230
AT^SHOM Display Homezone.............................................................................................230
AT^SIND Extended Indicator Control ...................................................................................231
AT^SLCD Display Last Call Duration...................................................................................233
AT^SLCK Facility lock ..........................................................................................................234
AT^SLMS List Memory Storage...........................................................................................238
AT^SM20 Set M20 Compatibility .........................................................................................239
AT^SMGL List SMS messages from preferred storage.......................................................240
AT^SMGR Read SMS message without set to REC READ ................................................241
AT^SMGO Set or query SMS overflow presentation mode or query SMS overflow ...........242
AT^SMONC Cell Monitoring ................................................................................................243
AT^SMONG GPRS Monitor .................................................................................................244
AT^SMSO Switch off mobile station ....................................................................................245
AT^SNFA Set or query microphone attenuation..................................................................246
Audio programming model ....................................................................................................247
AT^SNFD Set audio parameters to manufacturer default values........................................248
AT^SNFI Set microphone path parameters .........................................................................249

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8.28
8.29
8.30
8.31
8.32
8.33
8.34
8.35
8.36
8.37
8.38
8.39
8.40
8.41
8.42
8.43
8.44
8.45
8.46
8.47
8.48
8.49

AT^SNFM Mute microphone................................................................................................250
AT^SNFO Set audio output (= loudspeaker path) parameter..............................................251
AT^SNFPT Call progress tones ..........................................................................................253
AT^SNFS Select audio hardware set...................................................................................254
AT^SNFV Set loudspeaker volume......................................................................................256
AT^SNFW Write audio setting in non-volatile store .............................................................257
AT^SPBC Search the first entry in the sorted telephonebook .............................................258
AT^SPBD Purge phonebook memory storage ....................................................................259
AT^SPBG Read entry from active telephonebook via sorted index ....................................260
AT^SPBS Step through the selected phonebook alphabetically .........................................264
AT^SPIC Display PIN counter..............................................................................................267
AT^SPLM Read the PLMN list .............................................................................................271
AT^SPLR Read entry from the preferred operators list .......................................................272
AT^SPLW Write an entry to the preferred operators list......................................................273
AT^SPWD Change password for a lock ..............................................................................274
AT^SRTC Select, query, test ring tone parameters.............................................................277
AT^SSCONF SMS Configuration........................................................................................279
AT^SSDA Set Display Availability.......................................................................................280
AT^SSET Settings for Unsolicited Result Code "SIM READY" ...........................................281
AT^SSMSS Set Short Message Storage Sequence...........................................................282
AT^SSYNC Configure SYNC Pin.........................................................................................283
AT^STCD Display Total Call Duration .................................................................................284

9

APPENDIX .................................................................................................285

9.1
9.1.1
9.1.2
9.1.3
9.1.4
9.1.5
9.1.6
9.1.7
9.1.8
9.1.9
9.1.10
9.1.11
9.1.12
9.1.13
9.1.14
9.1.15
9.1.16
9.1.17
9.1.18
9.1.19
9.1.20
9.1.21
9.1.22
9.2
9.3
9.4
9.4.1
9.5
9.6

Summary of ERRORS and Messages..................................................................................285
Summary of CME ERRORS related to GSM 07.07..............................................................285
Summary of GPRS-related CME ERRORS..........................................................................286
Summary of CMS ERRORS related to GSM 07.05..............................................................287
Summary of Unsolicited Result Codes (URC) ......................................................................290
Result codes .........................................................................................................................293
Cause Location ID for the extended error report (AT+CEER) ..............................................294
GSM release cause for L3 Radio Resource (RR) (AT+CEER) ...........................................295
Siemens release cause for L3 Radio Resource (RR) (AT+CEER)......................................295
GSM release cause for Mobility Management (MM) (AT+CEER) ........................................296
Siemens release cause for L3 Mobility Management (MM) (AT+CEER) .............................297
GSM release cause for L3 Call Control (CC) (AT+CEER) ...................................................297
Siemens release cause for L3 Call Control (CC) (AT+CEER)..............................................298
Siemens release cause for L3 Advice of Charge (AOC) (AT+CEER) .................................299
GSM release cause for Supplementary Service call (AT+CEER) ........................................299
Siemens release cause for Call related Supplementary Services (CRSS) (AT+CEER) ....300
Siemens cause for Supplementary Services Entity ..............................................................300
Siemens cause for Supplementary Services Manager.........................................................301
GSM release cause for Session Management (SM) (AT+CEER) ........................................302
SIEMENS release cause for Session Management (SM) (AT+CEER) ................................302
SIEMENS release cause for GPRS API (AT+CEER) ..........................................................303
SIEMENS release cause for Embedded Netcore (AT+CEER)...........................................303
GSM cause for L3 Protocol module or other local cause (AT+CEER) .................................303
Summary of PIN requiring AT Commands............................................................................304
AT commands available before entering the SIM PIN..........................................................306
Standard GSM service codes ...............................................................................................309
Additional notes on ^SCCFC, +CCWA, ^SCLCK .................................................................311
GSM alphabet tables and UCS2 character values ...............................................................312
Sort order for phonebooks ....................................................................................................314

Figures
Figure 1: AT audio programming model...............................................................................................247
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Tables
Table 1: Types of AT commands and responses...................................................................................10
Table 2: Illegal combinations of AT commands......................................................................................11
Table 3: Explanation of terms.................................................................................................................13
Table 4: Character definitions depending on alphabet (examples)........................................................13
Table 5: Direction ME to TE (output of SIM data to the TE)...................................................................14
Table 6: Direction TE to ME (input of Terminal data to SIM) .................................................................15
Table 7: Factory settings ........................................................................................................................42
Table 8: AT&V responses on ASC0 or multiplex channel 1...................................................................45
Table 9: AT&V responses on multiplex channels 2 / 3...........................................................................46
Table 10: List of settings stored to user profile on ASC0 or multiplex channel 1...................................47
Table 11: List of settings stored to user profile on multiplex channel 2 and 3 .......................................48
Table 12: Service Classes supported by ME .........................................................................................54
Table 13: Summary of AT commands available in Alarm mode ............................................................73
Table 14: Wake-up events in NON-CYCLIC and CYCLIC SLEEP modes ............................................91
Table 15: Availability of AT commands on virtual channels .................................................................118
Table 16: Summary of AT commands with different behavior in Multiplex mode ...............................118
Table 17: Timing algorithm of incorrect password input.......................................................................135
Table 18: Operating modes of the ME indicated by status LED (if  = 1):................................283
Table 19: Summary of URCs................................................................................................................290
Table 20: Summary of Fax Class 2 URCs defined by EIA PN-2388 ...................................................292
Table 21: GSM service codes ..............................................................................................................309

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1 Introduction
1.1

Scope of the document

This document presents the AT Command Set for the Siemens cellular engine
MC39i
MC39i features basic SIM Application Toolkit (SAT) functionality which enables SIM cards to run additional network based applications, such as value added services, online banking, information services
etc. To give you an idea, Chapter 7 provides a brief overview. In greater detail, the SAT functions and
the required AT commands are described in [4].

1.2
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]

Related documents
MC39i Hardware Interface Description, Version 01.02
MC39i Release Notes, Release 01.02
GPRS Startup User's Guide
Remote-SAT User's Guide
Multiplexer User's Guide
Multiplex Driver Developer’s Guide for Windows 2000 and Windows XP
Multiplex Driver Installation Guide for Windows 2000 and Windows XP
DSB35 Support Box – Evaluation Kit for Siemens Cellular Engines
Application Note 02: Audio Interface Design
Application Note 14: Audio and Battery Parameter Download
Application Note 16: Upgrading MC39i Firmware
Application Note 24: Application Developer’s Guide

Prior to using MC39i or upgrading to a new firmware release, be sure to carefully read the latest product information provided in the Release Notes.

To visit the Siemens Website you can use the following link:
http://www.siemens.com/wm

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1.3

Conventions and abbreviations

Throughout the document, the GSM engines are referred to as ME (Mobile Equipment), MS (Mobile
Station), TA (Terminal Adapter), DCE (Data Communication Equipment) or facsimile DCE (FAX modem, FAX board).
To control your GSM engine you can simply send AT Commands via its serial interface. The controlling device at the other end of the serial line is referred to as TE (Terminal Equipment), DTE (Data
Terminal Equipment) or plainly “the application” (probably running on an embedded system).
All abbreviations and acronyms used throughout this document are based on the GSM specifications.
For definitions please refer to TR 100 350 V7.0.0 (1999-08), (GSM 01.04, version 7.0.0 release 1998).

1.4

AT command syntax

The "AT" or "at" prefix must be set at the beginning of each command line. To terminate a command
line enter .
Commands are usually followed by a response that includes “”.
Throughout this document, only the responses are presented,  are omitted intentionally.
Table 1: Types of AT commands and responses
Test command

AT+CXXX=?

Read command

AT+CXXX?

Write command
Execution command

AT+CXXX=<...>
AT+CXXX

The mobile equipment returns the list of parameters and
value ranges set with the corresponding Write command
or by internal processes.
This command returns the currently set value of the
parameter or parameters
This command sets user-definable parameter values.
The execution command reads non-variable parameters
affected by internal processes in the GSM engine.

1.4.1 Using parameters
· Factory defaults are underlined or, if necessary, explicitly stated in the parameter description. A
factory value will be loaded on power-up if the parameter is not storable (for example if not stored
when AT^SMSO is executed, or not stored to the user profile specified with AT&W, or not stored to
the audio profile defined with AT^SNFW). To restore factory defaults use AT&F. A variety of audio
parameters can be reset to their factory defaults using AT^SNFD.
· Optional parameters are enclosed in square brackets, for example [0]. If optional parameters are
omitted, the bracketed value will be used by default. If a parameter is not enclosed in brackets and
no other behavior is stated, the current setting remains unchanged when the parameter is omitted.
· To ensure the correct sequence of optional and mandatory parameters, a comma must be kept for
each omitted parameter that is followed by further parameters. Example:
AT+CPBW=,,, writes a phonebook entry to the first free memory location.
AT+CPBW=,,, writes a phonebook entry to the memory location
specified by .
· When the parameter is a character string, e.g.  or , the string must be enclosed in
quotation marks, e.g. "Charlie Brown" or "+49030xxxx". Symbols within quotation marks will be
recognized as strings.
· All spaces will be ignored when using strings without quotaton marks.
· It is possible to omit the leading zeros of strings which represent numbers.

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1.4.2 Combining AT commands on the same command line
You may enter several AT commands on the same line. This eliminates the need to type the "AT" or
"at" prefix before each command. Instead, it is only needed once at the beginning of the command
line. Use a semicolon as command delimiter.
The command line buffer accepts a maximum of 391 characters. If this number is exceeded none of
the commands will be executed and TA returns ERROR.
The table below lists the AT commands you cannot enter together with other commands on the same
line. Otherwise, the responses may not be in the expected order.
Table 2: Illegal combinations of AT commands
V.25ter commands
GSM 7.07 commands
GSM 7.05 commands (SMS)
Commands starting with AT&
AT+IPR

With
With
-------

FAX commands, Prefix AT+F
Siemens commands, Prefix AT^S
To be used standalone
To be used standalone
To be used standalone

Note: When concatenating AT commands please keep in mind that the sequence of processing may
be different from the sequential order of command input. Therefore, if the consecutive order of
the issued commands is your concern, avoid concatenating commands on the same line.

1.4.3 Entering successive AT commands on separate lines
When you enter a series of AT commands on separate lines, leave a pause between the preceding
and the following command until the final response (for example OK, CME error, CMS error) appears.
This avoids sending too many AT commands at a time without waiting for a response for each.

1.4.4 Communication between customer application and MC39i
Leaving hardware flow control unconsidered, the customer application (TE) is coupled with the MC39i
(ME) via a receive and a transmit line.
Since both lines are driven by independent devices collisions may (and will) occur, for example, if the
TE issues an AT command at the same time when MC39i starts sending a URC. This will probably
cause the TE to misinterpret the URC as part of the response returned to the AT command.
To avoid this conflict the following measures must be taken:
· If an AT command is finished (with "OK" or "ERROR") the TE shall always wait at least 100 milliseconds before sending the next one. This gives MC39i the opportunity to transmit pending URCs
and get necessary service.
Some AT commands may require more delay after an "OK" or "ERROR" response, refer to the following command specifications for details.
· The TE shall communicate with MC39i using activated echo (ATE1), i.e. MC39i echoes characters
received from the TE.
Hence, when the TE receives the echo of the first character "A" of the AT command just sent by itself it has control both over the receive and the transmit paths. This way, no URC can be issued by
MC39i in between.

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1.4.5 Unsolicited Result Codes (URCs)
An Unsolicited Result Code (URC) is a report message issued by the ME without being requested by
the TE, i.e. a URC is delivered automatically when a certain event occurs. Hence, a URC is not issued
as part of the response to an executed AT command.
Typical events leading to URCs are incoming calls (“RING”), received short messages, changing temperature, status of the battery etc. A summary of URCs is listed in Table 19 and Table 20.
To announce a pending URC transmission the ME will do the following:
· The ME activates its Ring line (logic "1") for one second, i.e. the line changes to physical "Low"
level. This allows the TE to enter power saving mode until ME related events request service.
· If the AT command interface is busy a "BREAK" will be sent immediately but the URC will not be
issued until the line is free. This may happen if the URC is pending
- while an AT command is being processed, i.e. during the time from sending the first character
"A" of an AT command by the TE until the ME has responded with "OK" or "ERROR", or
- during a data call.
Please note that AT command settings may be necessary to enable in-band signaling. For example, refer to AT+CMER or AT+CNMI.
It is strongly recommended to use the multiplex mode to map logical communication channels onto the
serial line of MC39i. For details refer to [5] and the AT command AT+CMUX. Doing so it is possible to
use one channel to still process URCs while having a data call active on another.
For most of these messages, the ME needs to be configured whether or not to send an unsolicited result code. Depending on the AT command, the URC presentation mode can be saved to the user defined profile (see AT&W in Chapter 2.38), or needs to be activated every time you reboot the ME.
Several URCs are not user definable, such as “^SYSSTART”, “^SYSSTART ALARM MODE”,
“^SYSSTART, “^SHUTDOWN” and the Fax Class 2 URCs listed in Table 20.
If autobauding is enabled (as factory default mode or set with AT+IPR=0) URCs generated after restart will be output at 57600 bps until the ME has detected the current bit rate. The URCs
“^SYSSTART” and “^SYSSTART ALARM MODE”, however, are not presented at all. For details
please refer to Chapter 2.45.1. To avoid problems we recommend to configure a fixed bit rate rather
than using autobauding.

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1.5

Supported character sets

The ME supports two character sets: GSM 03.38 (7 bit, also referred to as SMS alphabet) and UCS2
(16 bit, refer to ISO/IEC 10646). See Chapter 4.44 for information about selecting the character set.
Character tables are provided in Chapter 9.5.
Table 3: Explanation of terms
Term

GSM character hex. value

Data Coding Scheme

The Data Coding Scheme (dcs) is part of a short message and is saved on
the SIM. When writing a short message to the SIM in text mode, the dcs
stored with AT+CSMP is used.
The escape sequence used within a text coded in GSM default alphabet
(0x1B) must be correctly interpreted by the TE, both for character input
and output. To the module, an escape sequence appears like any other
byte received or sent.
IRA means that one byte is displayed as two characters in hexadecimal
format. For example,. the byte 0x36 (decimal 54) is displayed as "36" (two
chars).
TE is the terminal equipment that uses the GSM default alphabet as its
character set. MS Hyperterminal (often used with the module) is an ANSI /
ASCII terminal that does not support the GSM default alphabet.
The currently used TE character set is selected with AT+CSCS.

Escape sequences

IRA

TE

TE character set

Due to the constraints described below it is recommended to prefer the USC2 alphabet in any external
application.
If the GSM alphabet is selected all characters sent over the serial line are in the range from 0 ... 127.
CAUTION: GSM alphabet is not ASCII alphabet!
Several problems resulting from the use of the GSM alphabet:
1. "@" character with GSM alphabet value 0 is not printable by an ASCII terminal program (e.g. Mi©
®
crosoft Hyperterminal ).
2. "@" character with GSM alphabet value of binary 0 will terminate any C string!
This is because the \0 is defined as C string end tag. Therefore, the GSM Null character may
cause problems on application level when using a ´C´-function as „strlen()“. This can be avoided if
it is represented by an escape sequence as shown in Table 4.
By the way, this may be the reason why even network providers often replace "@"with “@=*” in
their SIM application.
3. Other characters of the GSM alphabet are misinterpreted by an ASCII terminal program. For example, GSM "ö" (as in "Börse") is assumed to be "|" in ASCII, thus resulting in "B|rse". This is because both alphabets mean different characters with values hex. 7C or 00 and so on.
4. In addition, decimal 17 and 19 which are used as XON/XOFF control characters when software
flow control is activated, are interpreted as normal characters in the GSM alphabet.
When you write characters differently coded in ASCII and GSM (e.g. Ä, Ö, Ü), you need to enter escape sequences. Such a character is translated into the corresponding GSM character value and,
when output later, the GSM character value can be presented. Any ASCII terminal then will show
wrong responses.
Table 4: Character definitions depending on alphabet (examples)
GSM 03.38
character
Ö
"
ò
@

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GSM character
hex. value
5C
22
08
00

Corresponding
ASCII character
\
“
BSP
NULL

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ASCII
Esc sequence
\5C
\22
\08
\00

Hex
Esc sequence
5C 35 43
5C 32 32
5C 30 38
5C 30 30

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CAUTION: Often, the editors of terminal programs do not recognize escape sequences. In this case,
an escape sequence will be handled as normal characters. The most common workaround to this
problem is to write a script which includes a decimal code instead of an escape sequence. This way
you can write, for example, short messages which may contain differently coded characters.

1.5.1 UCS2 and GSM data coding and conversion in SMS text mode and Remote-SAT
This chapter provides basic information on how to handle input and output character conversion for
SMS text mode and Remote-SAT if internal (ME) and external (TE) character representation differ, i.e.
if the Data Coding Scheme and the TE character set use different coding.

1.5.1.1 Implementing output of SIM data to the TE
Table 5: Direction ME to TE (output of SIM data to the TE)
dcs

CSCS
GSM
UCS2

7 bit

8 bit

16 bit

(GSM default)
Case 1
GSM (1:1)
Case 4
GSM to UCS2 (1:2)

Case 2
IRA (1:1)
Case 5
GSM to UCS2 (1:2)

(UCS2)
Case 3
IRA (2:2)
Case 6
IRA (2:2)

Case 1
Every byte will be sent as GSM-character (or ASCII if Hyperterminal is used).
Example: 0x41,0x21 → ”AB” (because of conversion from 7-bit to 8-bit)
Case 2
Every byte will be sent as IRA. No conversion.
Example: 0x41,0x42 → ”4142”
Case 3
Every byte will be sent as IRA. No conversion to GSM to avoid data loss.
Example: 0x00,0x41 → ”0041”
Problems:
· 0x41,0x42 → ”4142” (invalid GSM character, but ignored with respect to GSM 07.05)
· 0x41 → Error (there are two bytes needed)
Case 4
Every byte will be converted from GSM to UCS2.
Example: 0x41,0x42 → ”00410042”
Case 5
Every Byte will be converted from GSM to UCS2.
Example: 0x41,0x42 → ”00410042”
Case 6
Example: 0x41,0x42 → ”4142”
Problems: 0x41 → Error (there are two bytes needed)

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1.5.1.2 Implementing input of TE data to SIM
Table 6: Direction TE to ME (input of Terminal data to SIM)
CSCS

DCS
7 bit
(GSM default)
8 bit
16 bit
(UCS2)

GSM

UCS2

Case 1
GSM (1:1)
Case 2
GSM to UCS2 (1:2)
Case 3
IRA (2:2)

Case 4
GSM to UCS2 (2:1)
Case 5
GSM to UCS2 (2:1)
Case 6
IRA (2:2)

Case 1
Data will be packed to 7 bit.
Maximum text length: 160 characters
Example: ”AB” → 0x41,0x21
Case 2
Data will be saved without any conversion.
Maximum text length: 280 characters
Example: ”4142” → 0x41,0x42
Problems: ”8f” → Error (invalid GSM character)
Case 3
Two bytes are needed. No conversion.
Maximum text length: 280 characters
Example: ”0041” → 0x00,0x41
Problems: ”41” → Error (there are two bytes needed)
Case 4
Two bytes are needed. Two bytes will be convert to 1 Bye GSM and 7-bit packed.
Maximum text length: 640 characters
Example: ”00410042” → 0x41,0x21
Problems:
· ”41” → Error (there are two bytes needed)
· ”4142” → Error (invalid character)
· ”0000” → Error (not an ucs2 character)
· ”007B” → 0x1B,0x28 (the saved data are two bytes long, not 1 byte like in all other cases. This effects the maximum input length of a string).
Case 5
Two bytes are needed. Two bytes will be converted to 1 Byte GSM.
Maximum text length: 560 characters
Example: ”00410042” → 0x41,0x42
Problems:
· ”41” → Error (there are two bytes needed)
· ”4142” → Error (invalid character)
· ”0000” → Error (not a UCS2 character)
· ”007B” → 0x1B,0x28 (the saved data are two bytes long, not 1 byte like in all other cases. This effects the maximum input length of a string)

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Case 6
Two bytes are needed.
Maximum text length: 280 characters
Example: ”00410042” → 0x00,0x41,0x00,0x21
Problems:
· ”41” → Error (there are two bytes needed)
· ”0000” → Error (not an ucs2 character)
· ”007B” → 0x00,0x7B

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1.6

Flow control

Flow control is essential to prevent loss of data or avoid errors when, in a data or fax call, the sending
device is transferring data faster than the receiving side is ready to accept. When the receiving buffer
reaches its capacity, the receiving device should be capable to cause the sending device to pause until it catches up.
There are basically two approaches to regulate data flow: software flow control and hardware flow
control. The High Watermark of the input / output buffer should be set to approximately 60% of the total buffer size. The Low Watermark is recommended to be about 30%. The data flow should be
stopped when the capacity rises close to the High Watermark and resumed when it drops below the
Low Watermark. The time required to cause stop and go results in a hysteresis between the High and
Low Watermarks.
In Multiplex mode, it is recommended to use hardware flow control. For details please refer to [5].

1.6.1 Software flow control (XON/OFF flow control)
Software flow control sends different characters to stop (XOFF, decimal 19) and resume (XON, decimal 17) data flow. The only advantage of software flow control is that three wires would be sufficient
on the serial interface.

1.6.2 Hardware flow control (RTS/CTS flow control)
Hardware flow control sets or resets the RTS/CTS wires. This approach is faster and more reliable,
and therefore, the better choice. When the High Watermark is reached, CTS is set inactive until the
transfer from the buffer has completed. When the Low Watermark is passed, CTS goes active once
again.
To achieve smooth data flow, ensure that the RTS/CTS lines are present on your application platform.
The application should include options to enable RTS/CTS handshake with the GSM engine. This
needs to be done with the AT command AT\Q3 - it is not sufficient to set RTS/CTS handshake in the
used Terminal program only. For details refer to Chapter 2.3.
The default setting of the GSM engine is AT\Q0 (no flow control) which must be altered to AT\Q3
(RTS/CTS hardware handshake on). The setting is stored volatile. For use after restart, AT\Qn should
be stored to the user profile with AT&W.
AT\Q has no read command. To verify the current setting of AT\Q, simply check the settings of the active profile with AT&V.
Often, fax programs run an intialization procedure when started up. The intialization commonly includes enabling RTS/CTS hardware handshake, eliminating the need to set AT\Q3 once again. However, before setting up a CSD call, you are advised to check that RTS/CTS handshake is set.
Note:

After deactivating the RTS line, the ME may still send up to 264 bytes (worst case). This can
be easily managed if the buffer of the host application is sufficiently sized, and if a hysteresis
is implemented in its Rx buffer as mentioned in Chapter 1.6. For host applications that are required to handle a large amount of data at high speed, a total buffer capacity of at least 512
bytes is recommended.

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2 Standard V.25ter AT Commands
These AT Commands are related to ITU-T (International Telecommunication Union, Telecommunication sector) V.25ter document.
MC39i supports the registers S0-S29. You can change S0,S3,S4,S5,S6,S7,S8,S10,S18 by using the
appropriate ATSn commands. All the other registers are read-only and for internal usage only!

2.1

A/ Repeat previous command line

Execute command

Response

A/

Repeats previous command line. Line does not need to end with terminating
character.
Parameter

Reference

Note

V.25ter

· After beginning with the character “a“ or „A“, a second character “t“ ,”T“ or “/“
has to follow. In case of using a wrong second character, it is necessary to
start again with character “a“ or “A“.
· If autobauding is active (see Chapter 2.45) A/ (and a/) cannot be used.

2.2

+++ Switch from data mode or PPP online mode to command mode

Execute command

Response

+++

This command is only available during a CSD call or a GPRS connection. The
+++ character sequence causes the TA to cancel the data flow over the AT interface and switch to command mode. This allows you to enter AT commands while
maintaining the data connection to the remote device or, accordingly, the GPRS
connection.
OK
To prevent the +++ escape sequence from being misinterpreted as data, it must
be preceded and followed by a pause of at least 1000 ms. The +++ characters
must be entered in quick succession, all within 1000 ms.

Reference

Note:

V.25ter

· To return from command mode to data or PPP online mode: Enter ATO as described in Chapter 2.17.

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2.3

AT\Qn Flow control

Execute command

Response

AT\Q

OK
If RTS/CTS flow control is not supported by interface and  is 2 or 3
ERROR
Parameter



Reference

0

AT\Q0

No flow control

1

AT\Q1

XON/XOFF software flow control

2

AT\Q2

Only CTS by DCE

3

AT\Q3

RTS/CTS hardware flow control
Recommended for the following procedures: incoming or outgoing data calls, fax calls, GPRS
connections, MUX mode.
Often, the initialization routine of Fax programs includes enabling RTS/CTS handshake, eliminating
the need to issue AT\Q3 once again.

Note

· Factory default is 0 (no flow control).
· The setting of AT\Qn is stored volatile. For use after restart it should be stored
to the user defined profile (AT&W).
· For compatibility reasons, the AT\Qn command can be used in Multiplex mode,
though the settings will not take effect. However, be aware that whenever you
use the AT\Qn write command in Multiplex mode and then save the current
configuration to the user profile with AT&W, the changed AT\Qn setting will become active after restart.
· See also Chapter 1.6 for general information on flow control.

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2.4

ATA Answer a call

Execute command

ATA

TA causes remote station to go off-hook (e.g. answer call). Any additional commands on the same command line are ignored.
This command may be aborted generally by receiving a character during execution. It can´t be aborted in some connection setup states, such as handshaking.
Response

Response in case of data call, if successfully connected:
CONNECT TA switches to data mode.
Response in case of voice call, if successfully connected:
OK
When TA returns to command mode:
OK
Response if no connection:
NO CARRIER
Parameter



Connection status (string)
 output only if +ATX parameter setting with value > 0.

Reference

Note

V.25ter

· See also AT+ATX in Chapter 2.31 and and result codes in Chapter 9.1.5 for

· If AT+FCLASS setting is 1 or 2, all incoming calls will be answered as fax calls,
when ATA is issued on multiplexer channel 1 resp. ASC0. For calls explicitly
signaled as voice or data calls, this procedure will fail with result code “NO
CARRIER”, but the incoming call will continue to ring. It is possible to change
the AT+FCLASS setting to 0 while the call is ringing and to accept the call afterwards with ATA. See Chapter 3.5 for AT+FCLASS.

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2.5

ATD Mobile originated call to dial a number

Execute command

ATD[]
[ TA switches to data state.
Note:  output only if ATX parameter setting with value > 0.
When TA returns to command mode:
OK
If successfully connected and voice call:
OK
Parameter



String of dialing digits and optionally V.25ter modifiers (dialing digits): 09, * , #, +, A, B, C
V.25ter modifiers: these are ignored: ,(comma), T, P, !, W, @

Emergency call:



= Standardized emergency number 112 (no SIM needed)

 String of GSM modifiers:
I
Activates CLIR (disables presentation of own phone number to
called party)
i
Deactivates CLIR (enables presentation of own phone number
to called party)
G
Activates Closed User Group invocation for this call only.
g
Deactivates Closed User Group invocation for this call only.
<;>

Reference

V.25ter
GSM 07.07
GSM 02.07
Annex A

Only required to set up voice calls. TA remains in command mode.

General remarks
· Before setting up a data call, check that RTS/CTS handshake is enabled. See
Chapters 1.6 and 2.3.
· Parameter ”l“ and ”i“ only if no *# code is within the dial string.
·  is not supported for data calls.
·  is default for last number that can be dialed by ATDL.
· *# codes sent with ATD are treated as voice calls. Therefore, the command
must be terminated with a semicolon “;”.
· If ATD is used with a USSD command (e.g. ATD*100#;) an AT+CUSD=1 is
executed implicitly (see AT+CUSD, pg. 155).

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· Parameter ‘G’ or ‘g’ will be ignored if Closed User Group was already activated,
or accordingly, deactivated with AT+CCUG command. Call by call invocation of
CUG uses the settings provisioned by the provider or, if available, the settings
of the parameters  and  made with AT+CCUG. See also Chapter
4.8.
· See ATX command in Chapter 2.31 for setting result code and call monitoring
parameters. Refer to Chapter 9.1.5 for .
Blacklist management:
· The ME provides a blacklist function according to GSM02.07 Annex A. After a
predefined number of failed call attempts to the same number, the dialed number is entered into a read-only phonebook called “blacklist” (phonebook “BL”).
Call attempts to numbers contained in the blacklist will be barred by the ME and
not signaled to the network. An attempt to start a voice call to a barred phone
number will be stopped with CME ERROR 257 “Call barred”. An attempt to start
a data or fax call to a barred phone number will be answered immediately with
the result code “NO CARRIER”.
· GSM02.07 Annex A states a variety of conditions under which a number can be
removed from the blacklist. As far as timing conditions are concerned, the ME
deletes numbers from the blacklist if a timer condition specified in GSM02.07
Annex A is met. But the most important condition is that the blacklist should be
cleared if a user interaction is detected (key pressed). Since the module cannot
detect such user interaction, it is up to the application to clear the blacklist in
this case, using the AT^SPBD command. See Chapter 8.35.
Different call release indications
· Upon termination, an outgoing fax or data call may show a different result code
than a voice call would deliver under identical conditions. In order to track down
the actual reason for call release, ATS18 (see Chapter 2.28) or AT+CEER (see
Chapter 4.10) should be used.
Different response modes
· For voice calls two different response modes can be determined: TA returns
“OK” either after dialing was completed or after the call has been established.
The setting is made with AT^SM20 (see Chapter 8.17 for more details).
Factory default is AT^SM20=1. This causes the ME to return “OK” in case of
successful connection, otherwise one of the call release indications “NO CARRIER”, “NO DIAL TONE”, “NO CARRIER” will follow.
· Data calls: In data connections, call setup always terminates when the call has
been established (indicated by result code “CONNECT”) or when it fails
(indicated by “NO CARRIER”).
Using ATD during an active voice call:
· When a user originates a second voice call while there is already an active
voice call, the first call will be automatically put on hold.
· The second call attempt is acknowledged with “OK” immediately after dialing
with ATD has completed, without relation to a successful call setup. In case of
failure, the additional result codes “NO CARRIER”, “NO DIAL TONE”, “NO
CARRIER” will be presented afterwards (see example below).
This behavior is similar to the mode set with AT^SM20=0, but occurs also if
AT^SM20=1 and cannot be changed. To avoid different behavior in all procedures of voice call setup simply give priority to AT^SM20=0 (“OK” appears always immediately after dialing).
· The current states of all calls can be easily checked at any time by using the
AT+CLCC command. For details refer to Chapter 4.20.

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Example

The following example shows the call setup procedure when a call is already active and a second call attempt fails because the line of the called party is busy:
atd0301234567;
Dialing out the first party’s number.
OK
The first call is established.
atd0302222222;
OK

The number of the second party is dialed.
The response “OK” is issued immediately though no call
is established (same behavior as if you had chosen
AT^SM20=0).

BUSY

Line of second called party is busy.

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2.6

ATD> Originate call to phone number  in memory 

This command allows you to dial a phone number from a specific phonebook. To initiate a call, enter
a two letter abbreviation for the phonebook , followed by the memory location  of the desired entry. The location range of each phonebook can be queried with AT+CPBR (see Chapter
4.32).
Execute command

ATD>
[];

TA attempts to set up an outgoing call to the specified number.
This command may be aborted generally by receiving a character during execution. Abortion is not possible during some states of connection setup such as
handshaking.
Response

If error is related to ME functionality:
+CME ERROR: 
If no dialtone (parameter setting ATX2 or ATX4):
NO DIALTONE
If busy (parameter setting ATX3 or ATX4):
BUSY
If connection cannot be set up:
NO CARRIER
If successfully connected:
OK
Parameter

 phonebook:
"SM” SIM phonebook (storage depending on SIM card)

”FD” SIM fixdialing phonebook (storage depending on SIM card)
”LD” Last-dialing-phonebook (list of up to 10 most recently dialed
numbers. Depending on the SIM card, the storage is located
either on the SIM card only or shared by SIM and ME).
”MC” ME missed (unanswered received) calls list (up to 10 numbers)
”RC” Received calls list (up to 10 numbers stored in ME)
”ME” ME phonebook (up to 250 numbers)
”ON” Own numbers (MSISDNs) list. Storage depending on SIM
card.
Notes:

Refer to Chapter 4.33 for more information regarding the capacity of
each phonebook and types of storage (ME / SIM card).


Integer type memory location in the range of locations available in
the selected memory, i.e. the index number returned by AT+CPBR.



I

Activates CLIR (disables presentation of own phone number to
called party)

i

Deactivates CLIR (enables presentation of own phone number
to called party)

<;>

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The semicolon is mandatory since dialing from a phonebook is only
supported for voice calls.

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Reference

Note

V.25ter/GSM
07.07

· There is no  for emergency call (“EN”).
· The command is not applicable to data calls. Any attempt to dial a data call
number from  causes the result code “NO CARRIER” to appear.
· Parameter  only if no *# code is within the dial string.
· *# codes sent with ATD are treated as voice calls. Therefore, the command
must be terminated with a semicolon “;”.
· See ATX command in Chapter 2.31 for setting result code and call monitoring
parameters.

Example

To query the location number of the phonebook entry:
AT+CPBR=1,xx
TA returns the entries available in the active phonebook.
To dial a number from the SIM phonebook, for example the number stored to location 15:
ATD>SM15;
OK
To dial a phone number stored in the last dial memory on the SIM card:
ATD>LD9;
OK

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2.7

ATD> Originate call to phone number selected from active memory

This command can be used to dial a phone number selected from the active memory. The active
memory is the phonebook selected with AT+CPBS (see Chapter 4.33). To set up a call simply enter
the memory location of the desired entry. The memory location range of each phonebook can be
queried by AT+CPBR (see Chapter 4.32).
Execute command

ATD>[];

TA attempts to set up an outgoing call to the stored number.
The command may be aborted generally by receiving a character during
execution. Abortion is not possible during some states of connection setup
such as handshaking.
Response

If error is related to ME functionality:
+CME ERROR: 
If no dialtone (parameter setting ATX2 or ATX4):
NO DIALTONE
If busy (parameter setting ATX3 or ATX4):
BUSY
If a connection cannot be set up:
NO CARRIER
If successfully connected:
OK
Parameter



integer type memory location should be in the range of locations
available in the memory used, i.e. the index number returned by
AT+CPBR.

 I Activates CLIR (disables presentation of own phone number to
called party)
i Deactivates CLIR (enables presentation of own phone number
to called party)
<;>

The semicolon is mandatory since dialing from a phonebook is
only supported for voice calls.

Reference

Note

V.25ter/GSM 07.07

· Parameter  only if no *# code is within the dial string.
· The command is not applicable to data calls. Any attempt to dial a data
call number from  causes the result code “NO CARRIER” to appear.
· *# codes sent with ATD are treated as voice calls. Therefore, the command must be terminated with a semicolon “;”.
· See ATX command in Chapter 2.31 for setting result code and call monitoring parameters.

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2.8

ATD> Originate call to phone number in memory with corresponding field

This command searches the active phonebook for a given string  and dials the assigned phone
number. The active phonebook is the one set with AT+CPBS.
Execute command

ATD>[mgsm];

TA attempts to set up an outgoing call to stored number.
This command may be aborted generally by receiving a character during execution. Abortion is not possible during some states of connection setup such
as handshaking.
Response

If error is related to ME functionality:
+CME ERROR: 
If no dialtone (parameter setting ATX2 or ATX4):
NO DIALTONE
If busy (parameter setting ATX3 or ATX4):
BUSY
If a connection cannot be set up:
NO CARRIER
If successfully connected:
OK
Parameter

string type value (“x”), which should equal an alphanumeric field in
at least one phonebook entry in the searched memories; used character set should be the one selected with AT+CSCS.  can contain escape sequences as described in Chapter 1.5.
 must be enclosed in quotation marks (""), if escape sequences
or parameter  are used or if the alphanumeric strings contains a blank. If not, quotation marks are optional.
 I Activates CLIR (disables presentation of own phone number to
called party)
i Deactivates CLIR (enables presentation of own phone number to
called party)
<;>
The semicolon is mandatory since dialing from a phonebook is only
supported for voice calls.


Reference

Note

V.25ter/GSM 07.07

· The command is not applicable to data calls. Any attempt to dial a data call
number from  causes the result code “NO CARRIER” to appear.
· See ATX command in Chapter 2.31 for setting result code and call monitoring parameters. Refer to Chapter 9.1.5 for .

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2.9

ATDI Mobile originated call to dialable ISDN number 

Execute command

ATDI[;]

TA attempts to set up an outgoing call to ISDN number.
This command may be aborted generally by receiving a character during execution. Abortion is not possible during some states of connection setup such as
handshaking.
Response

If no dialtone (parameter setting ATX2 or ATX4):
NO DIALTONE
If busy (parameter setting ATX3 or ATX4):
BUSY
If a connection cannot be set up:
NO CARRIER
If successful connected and non-voice call:
CONNECT TA switches to data state.
Note:  output only if +ATX parameter setting with value > 0.
When TA returns to command mode:
OK
If successfully connected and voice call:
OK
Parameter



[+]

phone number

string with maximum length of 20 characters
+

international dialing format



ISDN number

string of digits: +,0-9, A, B, C
<;>

voice call

Reference

Note

V.25ter

See ATX command in Chapter 2.31 for setting result code and call monitoring parameters. Refer to Chapter 9.1.5 for .

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2.10 ATDL Redial last telephone number used
Execute command

ATDL[;]

This command redials the last telephone number dialed.
· To redial the last data call number simply enter ATDL
· To redial the last voice call number type ATDL;
The command may be aborted generally by receiving a character during execution. Abortion is not possible during some states of connection setup such as
handshaking.
Response

If there is no last number or number is not valid:
+CME ERROR
If no dialtone (parameter setting ATX2 or ATX4):
NO DIALTONE
If busy (parameter setting ATX3 or ATX4):
BUSY
If a connection cannot be set up:
NO CARRIER
If successfully connected and non-voice call:
CONNECT TA switches to data state.
Note:  output only if +ATX parameter setting with value > 0.
When TA returns to command mode:
OK
If successfully connected and voice call:
OK
Parameter

<;>

voice call

Reference

Note

V.25ter

· See ATX command in Chapter 2.31 for setting result code and call monitoring
parameters. Refer to Chapter 9.1.5 for .
· If terminated with semicolon, ATDL dials the last voice call number stored in
the “LD”phonebook. Otherwise, the last dialed data or fax number will be used
which is not stored in the “LD”phonebook. See Chapter 4.33.

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2.11 ATE Enable command echo
Write command

ATE[]

This setting determines whether or not the TA echoes characters received from
TE during command state.
Response

OK
Parameter

 0 Echo mode off
1 Echo mode on
Reference

Note

V.25ter

In case of using the command without parameter,  is set to 0.

2.12 ATH Disconnect existing connection
Execute command

ATH[n]

Disconnects any call in progress, such as voice, fax or CSD calls. See notes below for GPRS and multiplex mode.
Response

OK
Note:

OK is issued after circuit 109 (DCD) is turned off, if it was previously on.
Parameter



[0]

terminate call

Reference

Note

V.25ter

Using ATH in Multiplex mode:
· ATH terminates every voice, fax or CSD call, no matter on which logical channel ATH was executed. For more details see [2].
For example, if ATH is executed on channel 2 or 3, a voice call on channel 1
will be disconnected, too.
This behavior is in accordance with ITU-T V.25 ter; (07/97, see “6.3.6 Hook
control“: "ATH is terminating any call in progress").
Using ATH while GPRS is active during Multiplex mode:
· ATH clears an active PDP context or terminates an existing PPP connection,
but only if issued on the same logical channel where GPRS is used. It does not
affect PDP contexts and PPP connections on other interfaces or logical channels.
· See also Chapter 6.3.3, ATH Manual rejection of a network request for PDP
context activation.

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2.13 ATI Display product identification information
Execute command

Response

ATI
ME issues product information text
SIEMENS
MC39i
REVISION xx.yy
OK
Explanation of “Revision“ parameter:
Version xx and variant yy of software release.

Reference

Note

V.25ter

2.14 ATI[value] Display additional identification information
Execute command

Response

ATI[value]

=9 delivers the following information. Other values are not supported and
only return OK.
ATI9

Reference

SIEMENS Gipsy Soft Protocolstack V2.550

Note

V.25ter

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2.15 ATL Set monitor speaker loudness
Execute command

Response

ATL[val]

OK

Reference

Note

V.25ter

· The two commands ATL and ATM are implemented only for V.25ter compatibility reasons and have no effect.
· In multiplex mode the command is supported on logical channel 1 only.

2.16 ATM Set monitor speaker mode
Execute command

Response

ATM[val]

OK

Reference

Note

V.25ter

· The two commands ATL and ATM are implemented only for V.25ter compatibility reasons and have no effect.
· In multiplex mode the command is supported on logical channel 1 only.

2.17 ATO Switch from command mode to data mode / PPP online mode
Execute command

Response

ATO[n]

ATO is the corresponding command to the +++ escape sequence described in
Chapter 2.2: When you have established a CSD call or a GPRS connection and
TA is in command mode, ATO causes the TA to resume the data or GPRS connection and takes you back to data mode or PPP online mode.
If connection is not successfully resumed
NO CARRIER
or
TA returns to data or PPP online mode from command mode
CONNECT 
Note:  output only if +ATX parameter setting with value > 0.
Parameter


Reference

[0]

switch from command mode to data or PPP online mode

Note

V.25ter

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2.18 ATQ Set result code presentation mode
Write command

Response

ATQ[]

Specifies whether or not the TA transmits any result code to the TE. Information
text transmitted in response is not affected by this setting.
If =0:
OK
If =1:
(none)
Parameter



0 DCE transmits result code
1 Result codes are suppressed and not transmitted

Reference

Note

V.25ter

2.19 ATP Select pulse dialing
Execute command

Response

ATP

OK

Reference

Note

V.25ter

No effect for GSM

2.20 ATS0 Set number of rings before automatically answering the call
Read command

Response

ATS0?

 OK

Write command

Specifies whether or not the TA will accept an incoming data / fax call without
user intervention.  determines the number of rings to wait before the TA will
automatically answer.

ATS0=

Response

OK
Parameter



000

disables automatic answer mode

001-255 enables automatic answering after specified number of rings
(not supported on multiplex interfaces 2 and 3).
Reference

Note

V.25ter

· If  is set too high, the calling party may hang up before the call can be
automatically answered.
· The correlation between ATS7 and ATS0 is important.
Example: Call setup may fail if ATS0=20 and ATS7=30.
· On multiplex interfaces 2 and 3 only ATS0=0 is allowed.

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2.21 ATS3 Write command line termination character
Read command

Response

ATS3?

 OK
This parameter setting determines the character recognized by TA to terminate
an incoming command line.

Write command

ATS3=

Response

OK
Parameter



000-013-127

command line termination character

Reference

Note

V.25ter

Using other value than 13 can cause problems when entering commands.

2.22 ATS4 Set response formatting character
Read command

Response

ATS4?

 OK

Write command

This parameter setting determines the character generated by the TA for result
code and information text.

ATS4=

Response

OK
Parameter


Reference

000-010-127

response formatting character.

Note

V.25ter

2.23 ATS5 Write command line editing character
Read command

Response

ATS5?

 OK

Write command

This parameter setting determines the character recognized by TA as a request
to delete the immediately preceding character from the command line.

ATS5=

Response

OK
Parameter


Reference

000-008-127

command line editing character

Note

V.25ter

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2.24 ATS6 Set pause before blind dialing
Read command

Response

ATS6?

 OK

Write command

No effect for GSM

ATS6=

Response

OK
Parameter

000-255 number of seconds to wait before blind dialing.


Reference

Note

V.25ter

2.25 ATS7 Set number of seconds to wait for connection completion
Read command

Response

ATS7?

 OK

Write command

Specifies the number of seconds the TA will wait for the completion of the call
setup when answering or originating a data call. Also referred to as "no answer
timeout". To put it plainly, this is the time to wait for the carrier signal. If no carrier
signal is received within the specified time, the TA hangs up.

ATS7=

Response

OK
Parameter



000 – 060

no. of seconds to wait for connection completion.

Reference

Note

V.25ter

· Values greater than 60 cause no error, but  will be restored to the maximum value of 60.
· If called party has specified a high value for ATS0=, call setup may fail.
· The correlation between ATS7 and ATS0 is important.
Example: Call setup may fail if ATS7=30 and ATS0=20.
· ATS7 is only applicable to data calls.

2.26 ATS8 Set number of seconds to wait for comma dial modifier
Read command

Response

ATS8?

 OK

Write command

No effect for GSM

ATS8=

Response

OK
Reference

Note

V.25ter

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2.27 ATS10 Set disconnect delay after indicating the absence of data carrier
Read command

Response

ATS10?

 OK

Write command

This parameter setting determines the amount of time, that the TA remains connected in absence of a data carrier. If the data carrier is detected before disconnect, the TA remains connected.

ATS10=

Response
OK
Parameter


Reference

001-002-254

number of tenths of seconds of delay

Note

V.25ter

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2.28 ATS18 Extended error report
Read command

Response

ATS18?

 OK

Write command

The write command enables or disables the presentation of more detailed error
messages reported in the case of unsuccessful CSD or fax calls.

ATS18=

Parameter of the write command



0 – 255
Odd numbers enable the presentation of extended error reports.
Even numbers disable the presentation of extended error reports.

Response

OK
Extended error report

If the presentation is enabled (odd number), the TA returns an extended error report every time it fails to establish a data or fax call. Errors are reported only for
failures that occur before call setup is complete, for example if the result code
NO CARRIER, NO DIALTONE or BUSY appears.
Extended error report

+CAUSE: : 
Parameters of the extended error report

 Location ID as number code
Location IDs are listed in Chapter 9.1.6. Each ID is related to another table that contains a list of s.

Reason for last failure, stated as number code
 numbers and associated descriptions are listed in several tables, sorted by different categories (see Chapters 9.1.7 to
9.1.22). The Chapter numbers can be found proceeding from the
Location ID table in Chapter 9.1.6.
Reference

Note

Siemens

This command applies only to circuit switched data calls and fax calls. For voice
calls, extended error reports can be retrieved using the execute command
AT+CEER (Chapter 4.10).

Example

To enable the presentation of extended error reports:
ats18=1
OK
Now, a mobile originated data call fails. Call setup is terminated with an extended
error report, followed by the result code NO CARRIER:
atd0301234567
+CAUSE: 8:16
NO CARRIER
The Location ID 8 stated in Chapter 9.1.6 points to Chapter 9.1.11, where 16 =
“Normal call clearing”.

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2.29 ATT Select tone dialing
Execute command

Response

ATT

OK

Reference

Note

V.25ter

No effect for GSM

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2.30 ATV Set result code format mode
Write command

Response

ATV[]

This parameter setting determines the contents of the header and trailer transmitted with result codes and information responses.
When  =0
0
When  =1
OK
Parameter


[0] Information response: 
Short result code format: 
1 Information response: 
Long result code format: 
Reference

Note

V.25ter

In case of using the command without parameter  will be set to 0.
Information responses are listed in Chapter 9.1.5 (verbose code and numeric
code).

2.31 ATX Set CONNECT result code format and call monitoring
Write command

Response

ATX[]

This parameter setting determines whether or not the TA detects the presence of
dial tone and busy signal and whether or not TA transmits particular result codes.
OK
Parameter


[0]

CONNECT result code only returned, dial tone and busy detection are both disabled

1

CONNECT result code only returned, dial tone and busy
detection are both disabled

2

CONNECT result code returned, dial tone detection is
enabled, busy detection is disabled

3

CONNECT result code returned, dial tone detection is
disabled, busy detection is enabled

4

CONNECT result code returned, dial tone and busy detection are both enabled

Reference

Note

V.25ter

See Chapter 9.1.5 for related .

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2.32 ATZ Set all current parameters to user defined profile
Execute command

Response

ATZ[]

TA sets all current parameters to the user profile stored with AT&W. If a connection is in progress, it will be terminated. All defined GPRS contexts which are not
activated or not online will be undefined (see +CGDCONT,+CGQREQ,+CGQMIN
commands).
Note: Any additional commands on the same command line will be ignored. A delay of 300 ms is required before next command is sent, otherwise “OK” response
may be corrupted.
OK
Parameter

 [0] Reset to user profile
Reference

Note

V.25ter

MC39i can be assigned two profiles: the factory profile (restored with AT&F) and
the user profile (stored with AT&W).
Related chapters: AT&F in Chapter 2.35, AT&W in Chapter 2.38.

2.33 AT&C Set circuit Data Carrier Detect (DCD) function mode
Write command

Response

AT&C[]

This parameter determines how the state of circuit 109(DCD) relates to the detection of received line signal from the distant end.
OK
If DCD is not supported by the interface
ERROR
Parameter



[0]

DCD line is always ON.

1

DCD line is ON in the presence of data carrier only.

Reference

Note

V.25ter

Factory default is 1.

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2.34 AT&D Set circuit Data Terminal Ready (DTR) function mode
Write command

Response

AT&D[]

This command is only intended for data calls. The  parameter determines
how the TA responds when circuit 108/2 (DTR) is changed from ON to OFF during data mode.
OK
If DTR is not supported by the interface and  is 1 or 2
ERROR
Parameter



[0]

TA ignores status on DTR.

1

ON->OFF on DTR: Change to command mode while retaining
the connected call.

2

ON->OFF on DTR: Disconnect data call, change to command
mode. During state DTR = OFF is auto-answer off.

Reference

Note

V.25ter

Factory default is 2 if DTR is supported by the interface, otherwise 0.

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2.35 AT&F Set all current parameters to manufacturer defaults
Execute command

Response

AT&F[value]

TA sets all current parameters to the manufacturer defined profile.
Note: Any additional commands on the same command line will be ignored. A delay of 300 ms is required before next command is sent, otherwise “OK” response may be corrupted.
OK
Parameter



0

Set all TA parameters to manufacturer default.
See Table 7: Factory settings.

Reference

Note

V.25ter

In addition to the default profile, you can store an individual one with
AT&W. To alternate between the two profiles enter either ATZ (loads
user profile) or AT&F (restores factory profile). Refer to Chapter 2.38 for
AT&W and Chapter 2.32 for ATZ.
Audio parameters set with AT^SNFA, AT^SNFO and AT^SNFI can be
restored with AT^SNFD. See Chapter 8.26.

Table 7: Factory settings
AT command

Restored parameters

AT\Q
ATE
ATQ
ATS0
ATS3
ATS4
ATS5
ATS6
ATS7
ATS10
ATS18
ATV
ATX
AT&C
AT&D
AT&S
AT+ILRR
AT+FCLASS
AT+CBST
AT+CFUN
AT+CLIP
AT+CMEE
AT+CMER

=0
=1
=0
=000
=013
=010
=008
=000
=060
=002
=0
=1
=4
=1
=2
=0
=0
=0
=7, =0, =1
=1
=0
=0
=0, =0, =0, =0, =0

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AT command

Restored parameters

AT+COPS
AT+CPBS
AT+CR
AT+CRC
AT+CREG
AT+CRLP
AT+CSCS
AT+CSCS
AT+CSSN
AT+VTD
AT+CMGF
AT+CNMI
AT+CSDH
AT+CSMP
AT+CSMS
AT^SMGO
AT^SSCONF
AT^SSDA
AT^SSMSS
AT^SACM
AT^SCKS
AT^SCTM
AT^SM20
AT^SPBS

=0
=”SM”
=0
=0
=0
=61, =61, =78, =6
=”GSM”
=”GSM”
=0, =0
=1
=0
=0, =0, =0, =0, =1
=0
=0, =17, =0, =167
=0, =1, =1, =1
=0
=0
=0
=0
=0
=0
=0, 
=0
=1, =1
internal counter

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2.36 AT&S Set circuit Data Set Ready (DSR) function mode
Write command

Response

AT&S

This parameter determines how the TA sets circuit 107 (DSR) depending on the
communication state of the TA interfacing TE.
OK
If DSR is not supported by the interface
ERROR
Parameter



0

DSR always on.

1

TA in command mode: DSR is OFF.
TA in data mode: DSR is ON.

Reference

Note

V.25ter

Factory default is 0.

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2.37 AT&V Display current configuration
Execute command

Response

AT&V[]

TA returns the current parameter setting. The configuration varies depending on
whether or not PIN authentication has been done, or Multiplex mode has been
activated.
Parameter


Reference

0 profile number

Note:

· Parameter values and order are subject to change.
· The parameters of AT^SMGO can only be displayed after the SMS data from
the SIM have been read successfully for the first time. Reading starts after
successful SIM authentication has been performed, and may take up to 30
seconds depending on the SIM used. While the read process is in progress,
an attempt to read the parameter will result in empty values.
· The parameter of AT+CSDH will only be displayed in SMS text mode, i.e. if
AT+CMGF=1.

Table 8: AT&V responses on ASC0 or multiplex channel 1
PIN authentication done

No PIN authentication

ACTIVE PROFILE:
ACTIVE PROFILE:
E1 Q0 V1 X4 &C1 &D2 &S0 \Q0
E1 Q0 V1 X4 &C1 &D2 &S0 \Q0
S0:000 S3:013 S4:010 S5:008 S6:000 S7:060 S0:000 S3:013 S4:010 S5:008 S6:000 S7:060
S8:000 S10:002 S18:000
S8:000 S10:002 S18:000
+CBST: 7,0,1
+CBST: 7,0,1
+CRLP: 61,61,78,6
+CRLP: 61,61,78,6
+CR: 0
+CR: 0
+FCLASS: 0
+FCLASS: 0
+CRC: 0
+ILRR: 0
+CMGF: 1
+IPR: 57600
+CSDH: 0
+CMEE: 2
+CNMI: 0,0,0,0,1
^SCKS: 0,1
+ILRR: 0
^SSET: 0
+IPR: 57600
+CGSMS: 3
+CMEE: 2
OK
^SMGO: 0,0
+CSMS: 0,1,1,1
^SACM: 0,”000000”,”000000”
^SCKS: 0,1
^SSET: 0
+CREG: 0,1
+CLIP: 0,2
+CAOC: 0
+COPS: 0,0,”operator”
+CGSMS: 3
OK

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Table 9: AT&V responses on multiplex channels 2 / 3
PIN authentication done

No PIN authentication

ACTIVE PROFILE:
E1 Q0 V1 X4 &C1 &D0 &S0 \Q0
S0:000 S3:013 S4:010 S5:008
+CR: 0
+CRC: 0
+CMGF: 1
+CSDH: 0
+CNMI: 0,0,0,0,1
+ILRR: 0
+IPR: 19200
+CMEE: 2
^SMGO: 0,0
+CSMS: 0,1,1,1
^SACM: 0,”000000”,”000000”
^SCKS: 0,1
^SSET: 0
+CREG: 0,1
+CLIP: 0,2
+CAOC: 0
+COPS: 0,0,”operator”
+CGSMS: 3
OK

ACTIVE PROFILE:
E1 Q0 V1 X4 &C1 &D0 &S0 \Q0
S0:000 S3:013 S4:010 S5:008
+CR: 0
+ILRR: 0
+IPR: 19200
+CMEE: 2
^SCKS: 0,1
^SSET: 0
+CGSMS: 3
OK

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2.38 AT&W Store current configuration to user defined profile
Execute command

TA stores the current settings to a user defined profile in the non-volatile memory.

AT&W[]
Response

OK or if error is related to ME functionality: ERROR / +CME ERROR: 
Parameter



0 number of profile

Reference

Note

V.25ter

· The user defined profile will be loaded automatically after PowerUp. Use ATZ
to restore user profile and AT&F to restore factory settings. Until the first use of
AT&W, ATZ works as AT&F. See Chapter 2.32 for details on ATZ and Chapter
2.35 for AT&F.
· On each multiplexer channel you can save an individual profile.

Table 10: List of settings stored to user profile on ASC0 or multiplex channel 1
AT command

Stored parameters

AT\Q
ATE
ATQ
ATS0
ATS3
ATS4
ATS5
ATS6
ATS7
ATS8
ATS10
ATS18
ATV
ATX
AT&C
AT&D
AT&S
AT+ILRR
AT+FCLASS
AT+CBST
AT+CLIP
AT+CMEE
AT+COPS
AT+CR
AT+CRC
AT+CREG
AT+CRLP
AT+CMGF
AT+CNMI




















, , 






, , , 

, , , , 

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AT command

Stored parameters

AT+CSDH
AT+CSMS
AT^SMGO
AT^SACM
AT^SCKS
AT^SSET








Table 11: List of settings stored to user profile on multiplex channel 2 and 3
AT command

Stored parameters

AT\Q
ATE
ATQ
ATS3
ATS4
ATS5
ATV
ATX
AT&C
AT&D
AT&S
AT+CLIP
AT+CMEE
AT+COPS
AT+CR
AT+CRC
AT+CREG
AT+CMGF
AT+CNMI
AT+CSDH
AT+CSMS
AT^SMGO
AT^SACM
AT^SCKS
AT^SSET



















, , , , 







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2.39 AT+GCAP Request complete TA capabilities list
Test command

Response

AT+GCAP=?

OK
Parameter

Execute command

Response

AT+GCAP

TA reports a list of additional capabilities.
+GCAP: 
OK
Parameter

 e.g.: +CGSM,+FCLASS
Reference

Note

V.25ter

+CGSM: The response text shows which GSM commands of the ETSI standard
are supported.

2.40 AT+GMI Request manufacturer identification
Test command

Response

AT+GMI=?

OK

Execute command

Response

AT+GMI

TA reports information to identify the manufacturer.
SIEMENS
OK

Reference

Note

V.25ter

See also ”AT+CGMI Request manufacturer identification”, Chapter 4.12.

2.41 AT+GMM Request TA model identification
Test command

Response

AT+GMM=?

OK

Execute command

TA reports one or more lines of information text which permit the user to identify
the specific model of device.
MC39i
OK

AT+GMM

Reference

Note

V.25ter

See also ”AT+CGMM Request model identification”, Chapter 4.13.

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2.42 AT+GMR Request TA revision identification of software status
Test command

Response

AT+GMR=?

OK

Execute command

Response

AT+GMR

TA returns product software version identification text.
REVISION xx.yy
OK
xx.yy

Version xx and variant yy of software release.

Reference

Note

V.25ter

See also AT+CGMR Request revision identification of software status, Chapter
4.14.

2.43 AT+GSN Request TA serial number identification (IMEI)
Test command

Response

AT+GSN=?

OK

Execute command

Response

AT+GSN

TA reports one or more lines of information text which permit the user to identify
the individual device.

OK
Parameter



IMEI of the telephone (International Mobile station Equipment Identity)

Reference

Note

V.25ter

The serial number (IMEI) varies for every individual ME device.

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2.44 AT+ILRR Set TE-TA local rate reporting
Test command

Response

AT+ILRR=?

+ILRR: (list of supported s) OK
Parameter

See write command
Read command

Response

AT+ILRR?

+ILRR:  OK
Parameter

See write command
Write command

AT+ILRR=


The write command specifies whether or not an intermediate result code shall indicate the currently used local rate when an incoming or outgoing data call is established. The message is transmitted from the DCE (= TA) to the DTE (=TE) before the final result code of the connection setup (e.g. CONNECT) appears.
Response

OK
Parameter

 0 Disables reporting of local port rate
1 Enables reporting of local port rate
Intermediate result code

+ILRR:
Parameter



port rate setting in bit per second
0 (Autobauding, see Chapter 2.45.1)
300
600
1200
2400
4800
9600
14400
19200
28800
38400
57600
115200
230400

Reference

Note

V.25ter

Factory default is 0

Example

ATD”030112233445”
+ILRR: 57600
CONNECT 9600/RLP

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2.45 AT+IPR Set fixed local rate
Test command

Response

AT+IPR=?

+IPR: (list of supported auto-detectable s), (list of supported fixed-only
s) OK
Parameter

See write command
Read command

Response

AT+IPR?

+IPR:  OK
Parameter

See write command
Write command

AT+IPR=

This command specifies the DTE-DCE bit rate. When you set a fix rate, make sure
that both DTE (TE) and DCE (= TA) are configured to the same rate. When you
select autobauding the DCE will automatically recognize the bit rate currently used
by the DTE.
The setting is stored in the non-volatile memory and will be used whenever the
engine is powered up again. However, in case of autobaud mode (AT+IPR=0) the
detected DCE bit rate will not be saved and, therefore, needs to be resynchronized after restarting the ME (see Chapter 2.45.1).
Response

OK or if error is related to ME functionality: ERROR / +CME ERROR: 
Parameter

 bit rate per second
0 (Autobauding, see Chapter 2.45.1)
300
600
1200
2400
4800
9600
14400
19200
28800
38400
57600
115200
230400
Reference

Note

V.25ter

· Factory setting is AT+IPR=0 (autobauding). It cannot be restored with AT&F.
The current setting will be preserved when you download new firmware or
when the ME is powered down.
· In order to account for greater amounts of data it is recommended to choose a
minimum bit rate of 2400 bps. If the ME is operated in Multiplex mode we suggest a minimum bit rate of 4800 bps. See Chapter 4.28 for AT+CMUX.
· A selected bit rate takes effect after the write command returns OK (except for
Multiplex mode).
· In Multiplex mode, the write command AT+IPR= will not change the bit
rate currently used, but the new bit rate will be stored and becomes active,
when the module is restarted.

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· Generally, AT+IPR=x should be used as a standalone command. If nevertheless combinations with other commands on the same line cannot be avoided,
there are several constraints to be considered:
- Avoid combinations with the AT commands listed in Chapter 1.4.2.
- Take into account that a delay of 100 ms is required between a response to
the last command (e.g. OK) and the next command on the same line.
- When you enter AT+IPR=0, autobauding will be activated after the response to the last command is received.
- When local echo is active (ATE1) and you enter AT+IPR=x with other
commands you may encounter the following problem: If switching to the
new bit rate takes effect while a response is being transmitted, the last
bytes may be sent at the new bit rate and thus, not properly transmitted.
The following commands will be correctly sent at the new bit rate.

2.45.1 Autobauding
Synchronization between DTE and DCE
Ensure that DTE and DCE are correctly synchronized and the bit rate used by the DTE is detected by
the DCE (= ME). To allow the bit rate to be synchronized simply issue an "AT" or "at" string. This is
necessary
· after you have activated autobauding
· when you start up the module while autobauding is enabled. It is recommended to wait 3 to 5 seconds before sending the first AT character. Otherwise undefined characters might be returned.
If you want to use autobauding and autoanswer at the same time, you can easily enable the DTE-DCE
synchronization, when you activate autobauding first and then configure the autoanswer mode
(ATS0=n>0).
Restrictions on autobauding operation
· The serial interface has to be operated at 8 data bits, no parity and 1 stop bit (factory setting).
· The A/ command (and a/) cannot be used.
· Only the strings “AT“ or “at“ can be detected (neither “aT“ nor “At“).
· Unsolicited Result Codes that may be issued before the ME detects the new bit rate (by receiving
the first AT command string) will be sent at the previously detected bit rate. See further note below.
· It is not recommended to switch to autobauding from a bit rate that cannot be detected by the autobaud mechnism (e.g. 300 baud). Responses to +IPR=0 and any commands on the same line might
be corrupted.
Autobauding and bit rate after restart
The most recently detected bit rate cannot be stored when MC39i is powered down (with AT^SMSO).
Therefore, each time the module is restarted the correct bit rate must be found as described above.
Unless the bit rate is determined, the following constraints apply:
· An incoming CSD call or a network initiated GPRS request cannot be accepted. This must be taken
into account when autobauding and autoanswer mode (ATS0=n>0) are enabled at the same time,
especially if SIM PIN1 authentication is done automatically and the setting ATS0=n>0 is stored to
the user profile with AT&W (if not stored to the user profile ATS0 is reset to its default 000 after restart and thus not relevant for autobauding).
· Until the correct bit rate is found, URCs generated after restart will be output at 57600 bps. This
applies only to user defined URCs, such as “RING”, “+CREG”, “^SCKS”, “^SSIM” etc. (see list of
URCs in Chapter 9.1.4). The URCs "^SYSSTART" and "^SYSSTART ALARM MODE" will not be
indicated.
Note: To avoid any problems caused by undetermined bit rates in the direction from DCE to DTE we
strongly recommend to configure a fixed bit rate rather than using autobauding.
Autobauding and multiplex mode
If autobauding is active you cannot switch to multiplex mode (see Chapter 4.28).

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3 AT Commands for FAX
The following commands can be used for FAX transmission. If the ME is acting as a Fax modem to a
PC-based application (e.g. “WinFax“) it is necessary to select the proper Service Class (Fax Class)
provided by the ME. The ME reports its Service Class capabilities, the current setting and the range of
services available. This is provided by the AT+FCLASS command (see pg. 58).
Table 12: Service Classes supported by ME
+FCLASS parameter
0
1
2

Service Class
Data modem
Service Class 1
Manufacture specific

Reference, Standard
e.g. TIA/EIA-602 or ITU V.25ter
EIA/TIA-578-A
This document and EIA PN2388 (draft)

Notes:
· When sending a FAX with a standard FAX application for Personal Computers it is recommended
to use autobauding (AT+IPR=0).
· Responses that may occur during a fax call are presented in the form of Unsolicited Result Codes
(URCs). A summary of Fax specific URCs is listed in Chapter 9.1.4, Table 20.

The following AT commands are dummy commands. Invoking these commands will not cause ERROR result codes, but the commands have no functionality.
AT+FAA
Auto Answer mode
AT+FECM
Error Correction Mode control
AT+FLNFC
Page Length format conversion
AT+FLPL
Indicate document available for polling
AT+FMINSP Minimum Phase C speed
AT+FRBC
Phase C data receive byte count
AT+FREL
Phase C received EOL alignment
AT+FSPL
Enable polling
AT+FTBC
Phase C data transmit byte count
AT+FWDFC
Page width format conversion

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3.1

AT+FBADLIN Bad Line Threshold

Read command

AT+FBADLIN?

This command defines the “Copy-Quality-OK”-threshold. If  consecutive lines have pixel count errors in normal resolution (98 dpi) mode, then the
copy quality is unacceptable. If  * 2 consecutive lines have pixel count
errors in fine resolution (196 dpi) mode, then the copy quality is unacceptable.
“Copy Quality Not OK” occurs if either the error percentage is too high or too
many consecutive lines contain errors. A value of 0 implies that error checking
is not present or disabled.
Response

 OK
Parameter

See write command
Write command

Response

AT+FBADLIN=


OK
If error is related to ME functionality:
ERROR
Parameter



0 – 10 – 255 bad lines

Reference

Note

EIA PN-2388

Used for Fax Class 2 only

3.2

AT+FBADMUL Error Threshold Multiplier

Read command

AT+FBADMUL?

This command defines the “Copy-Quality-OK” multiplier. The number of lines
received with a bad pixel count is multiplied by this number. If the result exceeds the total number of lines on the page the error rate is considered too
high. A threshold multiplier value of 20 corresponds to a 5% error rate. A value
of 0 implies that error checking is not present or disabled.
Response

 OK
Parameter

See write command
Write command

Response

AT+FBADMUL=


OK
If error is related to ME functionality:
ERROR
Parameter



0 – 20 – 255

Reference

Note

EIA PN-2388

Used for Fax Class 2 only

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3.3

AT+FBOR Query data bit order

Test command

AT+FBOR=?

Query the bit order for receive mode. The mode is set by the ME depending on
the selected Service Class, see “AT+FCLASS Fax: Select, read or test service
class”, pg. 58.
Response

(list of supported bit order modes s)
OK
Parameter

See write command
Read command

Response

AT+FBOR?

 OK
Parameter

See write command
Write command

Response

AT+FBOR=

OK
Parameter



0

direct bit order for both Phase C and for Phase B/D data.

[1]

Reversed bit order for Phase C data, direct Bit Order for
Phase B/D data.

Reference

Note

EIA PN-2388

Used for Fax Class 2 only

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3.4

AT+FCIG Query or set the Local polling id

Test command

Response

AT+FCIG =?

(max. length of Local Polling ID string) (range of supported ASCII character
values) OK
Parameter

See write command
Read command

Response

AT+FCIG?

 OK
Parameter

See write command
Write command

Response

AT+FCIG =

OK
Parameter



Local Polling ID string, max. length and possible content as reported
by test command. Default value is empty string (“”).

Reference

Note

EIA PN-2388

See also “AT+FLID Query or set the Local Id setting capabilities”, pg. 64.
Used for Fax Class 2 only

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3.5

AT+FCLASS Fax: Select, read or test service class

Test command

See introduction to fax commands, pg. 54.

AT+FCLASS=?

Response

(list of supported s)
OK
Parameter

See write command
Read command

Response

AT+FCLASS?

 OK
Parameter

See write command
Write command

AT+FCLASS=


The ME is set to a particular mode of operation (data, fax). This allows the ME
to process information in a manner suitable for that type of information.
Response

OK
Parameter



[0]

data (e.g. EIA/TIA-602 or ITU V.25ter)

1

Fax Class 1 (EIA/TIA-578-A, Service Class 1)

2

Fax Class 2 (EIA/TIA SP-2388, an early draft version of
EIA/TIA-592-A – Service class 2.1)

Reference

Note

EIA/TIA-592-A

· Using Error Correcting Mode (ECM) when sending FAXes over GSM should
be avoided.
· If AT+FCLASS setting is 1 or 2, all incoming calls will be answered as fax
calls, when ATA is issued on multiplexer channel 1 resp. ASC0. For calls
explicitly signaled as voice or data calls, this procedure will fail with result
code “NO CARRIER”, but the incoming call will continue to ring. It is possible to change the AT+FCLASS setting to 0 while the call is ringing and to
accept the call afterwards with ATA.

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3.6

AT+FCQ Copy Quality Checking

Test command

This command controls Copy Quality checking when receiving a fax.

AT+FCQ =?

Response

(list of supported copy quality checking s)
OK
Parameter

See write command
Read command

Response

AT+FCQ?

 OK
Parameter

See write command
Write command

Response

AT+FCQ =

OK
Parameter



0

No copy quality checking. The ME will generate Copy Quality OK (MCF) responses to complete pages.

[1]

ME can check 1-D phase data. The connected application
must check copy quality for 2-D phase C data

Reference

Note

EIA PN-2388

Used for Fax Class 2 only.

3.7

AT+FCR Capability to receive

Write command

Response

AT+FCR=

OK
Parameter



[0]

ME will not receive message data. This can be used when
the application has insufficient storage. The ME can send
and can be polled for a file.

1

ME can receive message data.

Reference

Note

EIA PN-2388

Used for Fax Class 2 only

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3.8

AT+FDCC Query or set capabilities

Test command

AT+FDCC =?

This command allows the connected application to sense and constrain the
capabilities of the facsimile DCE (=ME), from the choices defined in CCITT
T.30 Table 2.
Response

(list of s), (list of 
s), (list of s), (list of s), (list of s),
(list of s), (list of s), (list of s)
OK
Parameter

VR: Vertical Resolution, BR: Bit Rate, WD: Page Width, LN: Page Length, DF:
Data Compression Format, EC: Error Correction Mode, BF: Binary File Transfer Mode, ST: Scan Time/Line.
Note: For further information see AT+FDIS, pg. 62
Read command

Response

AT+FDCC?

,
,,,,,,
OK
Parameter

See write command
Write command

Response

AT+FDCC=,

,,,
,,,


OK

Reference

Note

EIA PN-2388

Used for Fax Class 2 only

MC39i_ATC_V01.02

Parameter

VR: Vertical Resolution, BR: Bit Rate, WD: Page Width, LN: Page Length, DF:
Data Compression Format, EC: Error Correction Mode, BF: Binary File Transfer Mode, ST: Scan Time/Line.
Note: For further information see AT+FDIS, pg. 62

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3.9

AT+FDFFC Data Compression Format Conversion

Test command

AT+FDFFC=?

This parameter determines the ME response to a mismatch between the data
format negotiated for the facsimile session, reported by the +FDCS:DF subparameter, and the Phase C data desired by the controlling application, indicated by the optional +FDT:DF subparameter, or the +FDIS=DF subparameter
for the +FDR operation.
Response

(list of supported s) OK
Parameter

See write command
Read command

Response

AT+FDFFC?

 OK
Parameter

See write command
Write command

Response

AT+FDFFC =

OK
Parameter



[0]

Mismatch checking is always disabled. The controlling application has to check the +FDCS: DF subparameter and
transfer matching data.

Reference

Note

EIA PN-2388

Used for Fax Class 2 only

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3.10 AT+FDIS Query or set session parameters
Test command

AT+FDIS =?

This command allows the controlling application to sense and constrain the
capabilities used for the current session. It uses +FDIS to generate DIS or
DTC messages directly, and uses +FDIS and received DIS messages to generate DCS messages.
Response

(list of s), (list of 
s), (list of s), (list of s), (list of s),
(list of s), (list of s), (list of s)
Parameter

See write command
Read command

Response

AT+FDIS?

,
,,,,,,
OK
Parameter

See write command
Write command

Response

AT+FDIS =
,
,,
,,,
,

OK

Reference

Note

EIA PN-2388

Used for Fax Class 2 only

MC39i_ATC_V01.02

Parameter

Vertical Resolution

VR

0
normal, 98 lpi
1
fine, 196 lpi
Bit Rate
BR 0
2400 bit/s, V.27ter
1
4800 bit/s, V.27ter
2
7200 bit/s, V.29
3
9600 bit/s, V.29
Page Width
WD 0 *)
1728 pixels in 215mm
1
2048 pixels in 255 mm
2
2432 pixels in 303 mm
3
1216 pixels in 151 mm
4
864 pixels in 107 mm
Page Length
LN
0
A4, 297mm
1
B4, 364mm
2
unlimited length
Data Compression Format DF
0 *)
1-D modified Huffman
1
2-D modified read
2
2-D uncompressed mode
Error correction
EC 0 *)
disable ECM
(Annex A/T.30)
1
enable ECM, 64 bytes/frame
2
enable ECM, 256 bytes/frame
Binary File mode
BF
0 *)
disable BFT
Transfer Mode
1
enable BFT
Scan Time/Line
ST
0 *)
0 ms (at VR= normal)
1
5 ms
2
10 ms
3
10 ms
4
20 ms
5
20 ms
6
40 ms
7
40 ms
*) Note: Only the default value needs to be implemented. Use test command
to check which parameter values are really possible.

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3.11 AT+FDR Begin or continue phase C data reception
Execute command

The +FDR command initiates transition to Phase C data reception.

AT+FDR

Response

CONNECT
or
OK
If error is related to ME functionality:
ERROR
Reference

Note

EIA PN-2388

Used for Fax Class 2 only

3.12 AT+FDT Data Transmission
Execute command

AT+FDT

This command requests the ME to transmit a Phase C page. When the ME is
ready to accept Phase C data, it issues the negotiation responses and the
CONNECT result code to the application.
In Phase B, the +FDT command releases the ME to proceed with negotiation,
and releases the DCS message to the remote station. In Phase C, the +FDT
command resumes transmission after the end of a data stream transmited before.
Response

CONNECT
Write command

Response

AT+FDT=
,,
,
,

CONNECT
Parameter




DF,VR,BR,WD,LN comma separated parameter list

Data Compression Format

DF

0
1
2

1-D modified Huffman
2-D modified read
2-D uncompressed mode

Vertical Resolution

VR

Bit Rate

BR

0
1
0
1
2
3

normal, 98 lpi
fine, 196 lpi
2400 bit/s, V.27ter
4800 bit/s, V.27ter
7200 bit/s, V.29
9600 bit/s, V.29

Page Width

WD

Page Length

LN

0
1
2
3
4
0
1
2

1728 pixels in 215mm
2048 pixels in 255 mm
2432 pixels in 303 mm
1216 pixels in 151 mm
864 pixels in 107 mm
A4, 297mm
B4, 364mm
unlimited length

Reference

Note

EIA PN-2388

Used for Fax Class 2 only

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3.13 AT+FET End a page or document
Write command

AT+FET=

This command indicates that the current page or partial page is complete. An
ERROR response code results if this command is issued while the mode is onhook.
Response

OK
Parameter



Post Page Message Codes
1 another document next
2 no more pages or documents
4 another page, procedure interrupt
5 another document, procedure interrupt

Reference

Note

EIA PN-2388

Used for Fax Class 2 only

3.14 AT+FK Kill operation, orderly FAX abort
Execute command

This command causes the TA to terminate the session in an orderly manner.

AT+FK

Response

OK
Reference

Note

Used for Fax Class 2 only

3.15 AT+FLID Query or set the Local Id setting capabilities
Test command

Response

AT+FLID =?

(max. character length of Local ID string) (range of supported ASCII character
values) OK
Parameter

See write command
Read command

Response

AT+FLID?

< lid > OK
Parameter

See write command
Write command

Response

AT+FLID =

OK
Parameter



Local ID string, max. length and possible content as reported by test
command. Default value is empty string (“”).

Reference

Note

EIA PN-2388

See also “AT+FCIG Query or set the Local polling id”, pg. 56.
Used for Fax Class 2 only

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3.16 AT+FMDL Identify Product Model
Read command

Send the model identification to the TA

AT+FMDL?

Response

Gipsy Soft Protocolstack
OK
Reference

Note

Siemens

Used for Fax Class 2 only

3.17 AT+FMFR Request Manufacturer Identification
Read command

Send the manufacturer identification to the TA

AT+FMFR?

Response

SIEMENS
OK
Reference

Note

Siemens

Used for Fax Class 2 only

3.18 AT+FOPT Set bit order independently
Write command

AT+FOPT=

Model specific command to set bit order independently of the understanding
which is "mirrored" and which is direct.
Response

OK
Parameter



0 non-standard
1 standard

Reference

Note

Siemens

Used for Fax Class 2 only

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3.19 AT+FPHCTO DTE Phase C Response Timeout
Read command

AT+FPHCTO?

The time-out value  determines how long the DCE will wait for a command
after reaching the end of data when transmitting in Phase C. When time-out is
reached, the DCE assumes that there are no more pages or documents to send.
Response

 OK
Parameter

See write command
Write command

Parameter

AT+FPHCTO=




0 – 30 – 255

time-out value in 100ms units.

Response

OK
If error is related to ME functionality:
ERROR
Reference

Note

EIA PN-2388

Used for Fax Class 2 only

3.20 AT+FREV Identify Product Revision
Test command

Sends the revision identification to the TA

AT+FREV?

Response

V2.550
OK
Reference

Note

Siemens

Used for Fax Class 2 only

3.21 AT+FRH Receive Data Using HDLC Framing
Execute command

This command causes the TA to receive frames using the HDLC protocol and the
AT+FRH= modulation defined below. An ERROR response code results if this command is
issued while the modem is on-hook.
Response

CONNECT
If error is related to ME functionality:
ERROR
Parameter



modulation mode
3

V21 Ch2

24

V.27ter

2400 bps

48

V.27ter

4800 bps

72

V.29

7200 bps

96

V.29

9600 bps

Reference

Note

TIA/EIA-578

Used for Fax Class 1 only

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3.22 AT+FRM Receive Data
Test command

Response

AT+FRM=?

(List of supported modulation modes s) OK
Parameter

Write command

AT+FRM=

See write command
This command causes the TA to enter the receive mode using the modulation
defined below. An ERROR response code results if this command is issued while
the modem is on-hook.
Response

CONNECT
If error is related to ME functionality:
ERROR
Parameter



96

V.29

9600 bps

72

V.29

7200 bps

48

V.27ter

4800 bps

24

V.27ter

2400 bps

Reference

Note

TIA/EIA-578

Used for Fax Class 1 only

3.23 AT+FRS Receive Silence
Write command

AT+FRS=