Grandstream Networks Ip Phone Gxp21Xx Users Manual GXP User

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Grandstream Networks, Inc.
GXP21xx SIP Enterprise Phones

Grandstream Networks, Inc.

GXP21xx User Manual
Firmware version: 1.0.1.66

Page 1 of 1
Last Updated: 05/2011

TABLE OF CONTENTS
GXP21XX USER MANUAL
WELCOME.......................................................................................................................................................... 3
INSTALLATION ................................................................................................................................................. 4
EQUIPMENT PACKAGING ...................................................................................................................................... 4
CONNECTING YOUR PHONE .................................................................................................................................. 4
GXP2120/2110 EXTENSION UNIT ......................................................................................................................... 4
SAFETY COMPLIANCES ......................................................................................................................................... 6
WARRANTY ......................................................................................................................................................... 6
PRODUCT OVERVIEW ..................................................................................................................................... 7
USING THE GXP21XX SIP ENTERPRISE PHONE....................................................................................... 11
GETTING FAMILIAR WITH THE LCD .................................................................................................................... 11
MAKING PHONE CALLS ...................................................................................................................................... 13
ANSWERING PHONE CALLS ................................................................................................................................ 16
PHONE FUNCTIONS DURING A PHONE CALL ........................................................................................................ 17
CALL FEATURES ................................................................................................................................................ 19
CUSTOMIZED LCD SCREEN & XML ................................................................................................................... 19
CONFIGURATION GUIDE................................................................................................................................ 20
CONFIGURATION VIA KEYPAD............................................................................................................................ 20
CONFIGURATION VIA WEB BROWSER ................................................................................................................ 23
SAVING THE CONFIGURATION CHANGES ............................................................................................................. 38
REBOOTING THE PHONE REMOTELY.................................................................................................................... 38
SOFTWARE UPGRADE & CUSTOMIZATION ............................................................................................. 39
FIRMWARE UPGRADE THROUGH TFTP/HTTP ..................................................................................................... 39
CONFIGURATION FILE DOWNLOAD ..................................................................................................................... 40
RESTORE FACTORY DEFAULT SETTING.................................................................................................. 41

TABLE OF FIGURES
GXP21XX USER MANUAL
Figure 1: Connecting the GXP2120/2110 and the GXP Extension Board.....................................5
Figure 2: Keypad GUI Flow.......................................................................................................21
TABLE OF TABLES
GXP2120 USER MANUAL
Table 1:
Table 2:
Table 3:
Table 4:
Table 5:
Table 6:
Table 7:
Table 8:

Equipment Packaging ...................................................................................................4
GXP21xx Connectors....................................................................................................4
GXP21xx Product Models .............................................................................................7
GXP21xx Comparison Guide ........................................................................................7
GXP21xx Key Features in a Glance ..............................................................................8
GXP21xx Hardware Specifications ................................................................................8
GXP21xx Technical Specifications ................................................................................9
LCD Buttons ...............................................................................................................11

Grandstream Networks, Inc.

GXP21xx User Manual
Firmware version: 1.0.1.66

Page 1 of 41
Last Updated: 05/2011

Table 9: LCD Icons ...................................................................................................................12
Table 10: GXP21xx Keypad Buttons .........................................................................................12
Table 11: GXP Call Features ....................................................................................................19
Table 12: Key Pad Configuration Menu ..................................................................................... 20
Table 13: Device Configuration - Status .................................................................................... 24
Table 14: Device Configuration – Settings/Basic Settings.......................................................... 24
Table 15: Device Configuration – Settings /Advanced Settings.................................................. 27
Table 16: SIP Account Settings.................................................................................................32

Grandstream Networks, Inc.

GXP21xx User Manual
Firmware version: 1.0.1.66

Page 2 of 41
Last Updated: 05/2011

Welcome
Your Grandstream GXP21xx Enterprise IP phone is feature-enriched, sophisticated, yet simple to use.
The GXP21xx delivers superior HD audio quality, rich and leading edge telephony features, personalized
information and customizable application service, automated provisioning for easy deployment, advanced
security protection for privacy, and broad interoperability with most 3rd party SIP devices and leading
SIP/NGN/IMS platforms.
The GXP21xx supports a broad range of codecs, security protection, PoE, dual 10/100mbps Ethernet
ports, along with customizable XML provisioning and application features. Users can expect superior
audio quality using the new high definition handset, hands-free speakerphone, or headset. Also, it can
support up to 5-way conferencing, multi-languages, dual-color LEDs, presence and Busy Lamp Field
(BLF). It presents a large easy-to-read backlit graphical display along with multiple XML keys to further
enhance the user experience. The GXP2120/2110 is also expandable with one to two expansion modules.
The GXP21xx is a perfect choice for enterprise users looking for a high quality, feature rich multi-line IP
phone with the best values.

Caution: Changes or modifications to this product not expressly approved by Grandstream, or operation
of this product in any way other than as detailed by this User Manual, could void your manufacturer
warranty.
Warning: Please do not use a different power adaptor with the GXP21xx as it may cause damage to the
products and void the manufacturer warranty.

•

This document is subject to change without notice. The latest electronic version of this user manual is
available for download from: http://www.grandstream.com/support

•

Reproduction or transmittal of the entire or any part, in any form or by any means, electronic or print,
for any purpose without the express written permission of Grandstream Networks, Inc. is not
permitted.

Grandstream Networks, Inc.

GXP21xx User Manual
Firmware version: 1.0.1.66

Page 3 of 41
Last Updated: 05/2011

Installation
EQUIPMENT PACKAGING
Table 1: Equipment Packaging
Main Case
Handset
Phone Cord
Power Adaptor
Ethernet Cable
High Phone Stand
Low Phone Stand
Wall Mount Spacers (2)

GXP2120
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes

GXP2110
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes

GXP2100
Yes
Yes
Yes
Yes
Yes
Yes
No
Wall Mount stand

CONNECTING YOUR PHONE
The connectors of the GXP21xx are located on the bottom of the device.

Table 2: GXP21xx Connectors

EXT

Connect the GXP Extension unit directly to GXP2110/2120 using connection
cable. Draw power from PoE if provided by network. (Not applicable on GXP2100)

PC

10/100Mbps RJ-45 ports for PC (downlink) connection.

LAN

10/100Mbps RJ-45 port for LAN (uplink) connection. Supports PoE (802.3af).
Draws power from either spare line or signal line.

Power Jack

5V DC power port; UL Certified

Headset Jack

RJ9 and 2.5mm

Handset Jack

RJ9

GXP2120/2110 EXTENSION UNIT
GXP2120/2110 supports two (2) extension units, providing up to 112 additional programmable extensions.
Each GXP Extension unit has 56 multi-purpose keys, dual color LEDs (red/green) and support BLF (Busy
Lamp Field) and Presence.
GXP2120/2110 Extension package contains:
1) 1 GXP Extension unit
2) 2 connection cables
3) 1 universal power adaptor
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GXP21xx User Manual
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FIGURE 1: CONNECTING THE GXP2120/2110 AND THE GXP EXTENSION
GXP2120 with GXP Extension

GXP Extension

Connecting the GXP2120/2110
to GXP Extension

Reverse side of connection with
connection plate

Reverse side of connection w/connection
plate

GXP2120/2110 has a special port on
the back.

Connect the first GXP EXT to the GXP2120/2110 using the connection cable found in the GXP Extension
package. The first GXP EXT draws power directly from the phone. Connect the second GXP Extension unit
using the connection plate and the connection cable. The GXP2120/2110 will automatically reboot and
power up the GXP Extensions. Grandstream recommends, though not required, to use a separate power
supply with the second GXP EXT.
NOTE: Should your system lose power, please unplug your devices and power up the GXP2120/2110 first.
Powering up the system:
1.
2.
3.
4.
5.

The GXP2120/2110 will boot up first;
The GXP2120/2110 LEDs will be solid red;
The status light in the top right corner of the GXP Ext will blink in red;
All of the LED indicators on the GXP Ext will flash three times;
The status light at the top right corner of the GXP Ext will turn to solid green.

NOTE:
1. Extension for GXP2120/2110 is the same for GXP2020/2010 models. However, GXP2120/2110
uses a different-shaped connector for the special port (as shown above). Extension cables will be
included with the extension board.
2. Extension for GXP2120/2110 does not support hot-swap. Once connected, user should reboot the
phone to ensure the set up will work correctly.
3. GXP2120/2110 can drive 2 extension modules. Independent power adapters are not needed for
extension modules.

Grandstream Networks, Inc.

GXP21xx User Manual
Firmware version: 1.0.1.66

Page 5 of 41
Last Updated: 05/2011

SAFETY COMPLIANCES
The GXP21xx complies with FCC/CE and various safety standards. The GXP21xx power adaptor is
compliant with the UL standard. Only use the universal power adaptor provided with the GXP21xx package.
The manufacturer’s warranty does not cover damages to the phone caused by unsupported power adaptors.

WARRANTY
If you purchased your GXP21xx from a reseller, please contact the company where you purchased your
phone for replacement, repair or refund. If you purchased the product directly from Grandstream, contact
your Grandstream Sales and Service Representative for a RMA (Return Materials Authorization) number
before you return the product. Grandstream reserves the right to remedy warranty policy without prior
notification.

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GXP21xx User Manual
Firmware version: 1.0.1.66

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Product Overview
Table 3: GXP21xx Product Models

Model

Overview

Picture

GXP2120 is an executive SIP phone. It features:




GXP2120

Six lines
Seven programmable hard keys
Four XML programmable soft keys

GXP2110 is an executive SIP phone. It features:




GXP2110

Four lines
Eighteen programmable hard keys
Three XML programmable soft keys

GXP2100 is an executive SIP phone. It features:




GXP2100

Four lines
Seven programmable hard keys
Three XML programmable soft keys

Table 4: GXP21xx Comparison Guide
Features

GXP2120

GXP2110

GXP2100

LCD Display

320x160 pixel

240x120 pixel

180x90 pixel

Number of Lines

6

4

4

Programmable Hard Keys

7

18

7

Programmable Soft Keys

4

3

3

Extension Module

Yes, up to 2 Expansion
Modules, 56 nodes each

Yes, up to 2 Expansion
Modules, 56 nodes each

N/A

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Table 5: GXP21xx Key Features in a Glance

Features

Benefits

Open Standards Compatible

SIP RFC3261, TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, ARP/RARP,
ICMP, DNS (A record, SRV and NAPTR), DHCP (both client and server),
PPPoE, TELNET, TFTP, NTP, STUN, SIMPLE, SIP over TLS, 802.1x,
TR-069

Superb Audio Quality

Advanced Digital Signal Processing (DSP), Silence Suppression, VAD,
CNG, AGC

Network Interfaces

Dual 10/100mbps Ethernet ports with integrated PoE

Feature Rich

Traditional voice features including caller ID, call waiting, hold, transfer,
forward, block, auto-dial, off-hook dial

Advanced Features

Multi-line support with dual-color LED, multi-party conferencing, line
extension interface, large backlit graphic LCD, 4 navigation keys,
dedicated buttons for hold, send/redial, speakerphone, headset, transfer,
conference (for up to 5 parties depending on model), mute, message, DoNot-Disturb, phone book, intercom

Advanced Functionality

Customized downloadable ring-tones, SRTP, SIP over TLS, multilanguage support and XML enabled, adjustable positioning angles, wall
mountable, AES encryption, automatic multimedia service (eg., weather
information)

Table 6: GXP21xx Hardware Specifications

Model

GXP2120

LAN Interface
(Ethernet ports)
Graphic LCD
Display
Expansion
Module Support
Headset Jack
Call Appearance
LED

Two (2) 10/100 Mbps Full/Half Duplex Ethernet Switch with LAN and PC port with auto
detection
320x160 pixel
240x120 pixel
180x90 pixel
Yes

13 Dual color (green/red)

Power over
Ethernet
Universal
Switching
Power Adaptor
Dimension
Weight
Temperature

GXP2110

2.5mm and RJ9
22 Dual color (green/red)

GXP2100

No

11 Dual color (green/red)

Built-in auto-sensing: Cisco and IEEE 802.3af standard
Input: 100-240VAC 50-60
Hz
Output: +5VDC, 800mA,
UL certified
251mm(W) x 202mm(L) x
77mm(H)

Input: 100-240VAC 50-60
Hz
Output: +5VDC, 800mA,
UL certified
252mm (W) x 210mm (L) x
78mm (H)

Input: 100-240VAC 50-60
Hz
Output: +5VDC, 800mA,
UL certified
222mm (W) x 210mm (L)
x 93mm (H)

1.66KG (3.64lbs)

1.78KG (3.92lbs)
32 –104° F/ 0 – 40°C

1.63KG (3.59lbs)

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Humidity
Compliance

10% – 90% (non-condensing)
FCC / CE / C-Tick

Table 7: GXP21xx Technical Specifications

Lines

Protocol Support

Display
Feature Keys

Device Management

Audio Features

Grandstream Networks, Inc.

Multiple direct lines with independent SIP accounts, programmable speed dial
keys,
XML programmable soft-keys
Support SIP 2.0, TCP/UDP/IP, PPPoE, RTP/RTCP, SRTP by SDES, HTTP,
ARP/RARP, ICMP, DNS, DHCP, NTP, TFTP, SIMPLE/PRESENCE protocols,
TR-069, 802.1x
Support multiple SIP accounts and up to 11 media channels concurrently
Support SIP PUBLISH method (RFC 3903), SIP Presence package (RFC
3856, 3863) for use of MFKs, SIP Dialog package (RFC 4235)
Support for SIP MESSAGE method (RFC 3428)
Backlit graphic LCD display, up to 8 level grayscale
Feature keys on different models:
GXP2120
HOLD
Yes
SPEAKERPHONE Yes
SEND
Yes
TRANSFER
Yes
CONF
Yes
MUTE
Yes
DND
Yes
HEADSET
Yes
INTERCOM
Yes
PHONEBOOK
Yes
MSG
Yes
MENU
Yes
NAVIGATION (4)
Yes

GXP2110
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes

GXP2100
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes

NAT-friendly remote software upgrade (via TFTP/HTTP) for deployed devices
including behind firewall/NAT
Auto/manual provisioning system, Web GUI Interface
Expansion interface, Address Book
Full-duplex hands-free speakerphone, headset enabled
Advanced Digital Signal Processing (DSP)
Dynamic negotiation of codec and voice payload length
Support for G.723,1 (5.3/6.3K), G.729A/B, G.711 a/µ-law, G.726-32, G.722
(wide-band), and iLBC codecs
In-band and out-of-band DTMF (in audio, RFC2833, SIP INFO)
Silence Suppression, VAD (voice activity detection), CNG (comfort noise
generation), ANG (automatic gain control)
Acoustic Echo Cancellation (AEC) with Acoustic Gain Control (AGC) for
speakerphone mode, Support side tone
GXP21xx User Manual
Firmware version: 1.0.1.66

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Telephony Features

Network and
Provisioning

Firmware Upgrades

Advanced Server
Features
Security

Grandstream Networks, Inc.

Adaptive jitter buffer control (patent-pending) and packet delay & loss
concealment
HD audio handset with HD wideband audio codecs for excellent double-talk
performance.
Intuitive graphic user interface (GUI), downloadable phone book (XML, LDAP),
support for anonymous call using privacy header, MLS (multi-language
support)
Voice mail indicator, downloadable custom ring-tones, call hold, call transfer
(attended/blind), call forward, call waiting, caller ID, mute, redial, call log, caller
ID display or block, Do-Not-Disturb (DND) and volume control
Multi-party conferencing (up to 5), dial plan prefix, dial-plan support, off-hook
auto dial, auto answer, early dial and speed dial
Via keypad/LCD, Web browser, or secure (AES encrypted) central
configuration file, manual or dynamic host configuration protocol (DHCP)
network setup
Support NAT traversal using IETF STUN and Symmetric RTP
Support Layer 2 (802.1Q, VLAN, 802.1p) and Layer 3 QoS (ToS, DiffServ,
MPLS)
Support firmware upgrade via TFTP or HTTP
Support for Authenticating configuration file before accepting changes
User specific URL for configuration file and firmware files
Mass provisioning using TR-069 or encrypted XML configuration file
Message waiting indication, support DNS SRV Look up and SIP Server Fail
Over, Support customizable idle screen via downloading XML by HTTP/TFTP
User and administrator level passwords, MD5 and MD5-sess based
authentication, AES based secure configuration file, SRTP, TLS, 802.1x
media access control

GXP21xx User Manual
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Using the GXP21xx SIP Enterprise Phone
GETTING FAMILIAR WITH THE LCD
GXP21xx has a dynamic and customizable screen. The screen displays differently depending on whether the
phone is idle or in use (active screen).
Table 8: LCD Buttons
Key Button

Key Button Definitions

LINE SELECTORS

Selects the phone line printed on its right-hand side.

DATE AND TIME

Displays the current date and time. Can be synchronized with Internet time
servers.

LOGO

Displays company logo name. This logo name can be customized via xml screen
customization.

NETWORK STATUS

Displays the status of the phone and network. It will indicate whether the network
is down, starting or running (IP address). “## MISSED CALLS” is shown here too.

STATUS BAR

Shows the status of the phone, using icons as shown in the next table.

LINE STATUS INDICATOR

Displays the name of the account that is in use. Select another account by
pressing the LINE key on the left side.

SOFTKEYS

The softkeys are context sensitive and will change depending on the status of the
phone. Typical functions assigned to softkeys are:
•
FORWARD ALL Unconditionally forwards the phone line to another
phone
•
MISSED CALL This option shows up there were unanswered calls to
this phone. The Missed Calls option shows a list of the
missed calls
•
NEXTSCR
Press this button to toggle between idle screen, weather
and IP Address.
•
REDIAL
Redials the last number
•
END CALL
Hangs up phone

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Call Parking: FOR GXP2120/GXP2110 ONLY. Refer to the GXE5024/5028
Online User Manual for more information.
•
CallPark
When a GXP2120 dials out, the Call Park softkey

•

SPECIAL SOFTKEYS (Only
When Integrated with
GXE5024/5028)

PickUp

will display on screen. To park the call, press the
“Call Park” button.
When another GXP2120 goes off-hook the Call
Pickup softkey will display on screen. To pickup
the parked call, press the “Call Pickup” button.

Call Queue: FOR GXP2120/2110 ONLY. Refer to the GXE5024/5028 Online
User Manual for more information.
•
SignIn
Press this button to sign in to the call queue. Agent will
be prompted in the LCD display to select the call queue
to join. Press “menu” button on keypad to select “ok”.
Once the agent completely signs in, the agent will be
brought back to the main screen.
•
SignOut
Press this button to sign out of the call queue. Press
“menu” button on keypad to select “ok”. This will be
displayed once the agent is signed in to the call queue.

Table 9: LCD Icons

Icon

LCD Icon Definitions
DND Icon: ON when the “Do Not Disturb” is activated
Calls Forwarded Icon: INDICATES calls are forwarded
Voice Mail / Message Waiting Indicator: ON when there is new voice mail
/ message
Network Status: Network is down
Missed Call Icon: Indicates missed call(s)
Save Call Record: Indicates phone system writing the call records into the
flash. It might take 10 to 20 seconds to finish the process

Table 10: GXP21xx Keypad Buttons
Key Button
LINE KEYS

Key Button Definitions
2 Line keys with LED, can be configured to different SIP profiles

HOLD

Place ACTIVE call on hold

SEND

Press to dial out the number or redial when the phone is idle

TRANSFER
CONF
Grandstream Networks, Inc.

Transfer an ACTIVE call to another number
Press CONF button to connect Calling/Called party into conference
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MUTE
HEADSET
DND
INTERCOM
MENU

Mute an active call
Press HEADSET key to answer/hang up phone calls while using headset. It
also allows user to toggle between headset and speaker
Enable/Disable DND. (Not applicable on GXP2100)
Press to use intercom if intercom user ID is configured in web GUI
Press to enter menu when phone is in idle. Use it as ENTER key in keypad
configuration
Enter to retrieve voice mails or other messages
Brings phonebook on screen
Enable/Disable hands-free speaker
Enable/Disable handset mode ; or used as SEND/REDIAL
-Navigation keys “Up” “Down” “Left” “Right”. Press to navigate in menu
options
-During the call, press “Up” “Down” to adjust volume
-When the phone is idle, press “Up” to view missed call; press “Down” to view
phonebook

0 – 9, *, #
Multi Purpose Keys

Standard phone keypad; press # key to send call; press * key to for IVR
functions
18 MPKs in GXP2110 and 7 MPKs in GXP2120 used for BLF, Speed dial
and etc

MAKING PHONE CALLS
Handset, Speakerphone and Headset Mode
The GXP21xx allows you to make phone calls via handset, speakerphone, or headset mode. During the
active calls the user can switch between the handset and the speaker by pressing the speaker key. For
headsets to operate, the user must plug the headset to an RJ9 or 2.5mm port on the phone, which allows the
user to pick-up, speak, or hang-up calls.

Multiple SIP Accounts and Lines
GXP2120 can support up to 6 independent SIP accounts; GXP2110/GXP2100 can support up to 4
independent SIP accounts. Each account is capable of independent SIP server, user and NAT settings. Each
of the line buttons is “virtually” mapped to an individual SIP account. The name of each account is
conveniently printed next to its corresponding button. In off-hook state, select an idle line and the name of
the account (as configured in the web interface) is displayed on the LCD and a dial tone is heard.

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For example: Configure ACCOUNT 1 and ACCOUNT 2 with Account Name as “VoIP 1”, “VoIP 2”,
respectively and ensure that they are active and registered. When LINE1 is pressed, you will hear a dial tone
and see “VoIP 1” on the LCD display; when LINE2 is pressed, you will hear a dial tone and see “VoIP 2” on
the LCD display.
To make a call, select the line you wish to use. The corresponding LINE LED will light up in green. User can
switch lines before dialing any number by pressing the same LINE button one or more times. If you continue
to press a LINE button, the selected account will circulate among the registered accounts.
For example: when LINE1 is pressed, the LCD displays “VoIP 1”; If LINE1 is pressed twice, the LCD
displays “VoIP 2” and the subsequent call will be made through SIP account 2.
Incoming calls to a specific account will attempt to use its corresponding LINE if it is not in use. When the
“virtually” mapped line is in use, the GXP will flash the next available LINE (from left to right or from top to
bottom for Multi Purpose Keys) in red. A line is ACTIVE when it is in use and the corresponding LED is red.

Completing Calls
There are five ways to complete a call:
1. DIAL: To make a phone call.
• Take Handset/SPEAKER/Headset off-hook
or press an available LINE key (activates speakerphone)
or press the NEW CALL soft-key.
• The line will have a dial tone and the primary line (LINE1) LED is red.
If you wish, select another LINE key (alternative SIP account).
• Enter the phone number
• Press the SEND key
or press the “DIAL” soft-key.
2. REDIAL: To redial the last dialed phone number.
When redialing the phone will use the same SIP account as was used for the last call. Thus, when
the third SIP account was made for the last call/call attempt, the phone will use the third account to
redial.
• Press SEND key directly to redial or
• Take Handset/SPEAKER/Headset off-hook or
press an available LINE key (activates speakerphone), the corresponding LED will be red.
• Press the SEND button
or press the REDIAL soft-key.
3. USING CALL HISTORY: To call a phone number in Call History
When using the call history, the phone will use the same SIP account as was used for the last
call/call attempt. Thus, when returning a call made to the third SIP account, the phone will use the
third SIP account return the call.
• Press the MENU button to bring up the Main Menu.
• Select Call History and then “Answered Calls” “Dialed Calls”, “Missed Calls” “Transferred
Calls” or “Forwarded Calls” depending on your needs
• Select phone number using the arrow keys
• Press OK to select
• Press OK again to dial.

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4. USING THE PHONEBOOK: To call a phone number from Phonebook
Each entry in the phonebook can be attached to an individual SIP account. The phone will use that
SIP account to make the phone call.
• Go to the phonebook by:
i. Pressing the phonebook button (bottom, left-hand side of phone), or
ii. Pressing the DOWN arrow key, or
iii. Pressing the menu button and selecting “Phone book”
iv. Pressing MENU
• Select the phone number by using the arrow keys
• Press OK so select
• Press OK again to dial.
5. PAGING/INTERCOM :
The paging/intercom function can only be used if the SERVER/PBX supports this feature and both
the phones and PBX are correctly configured.
• Take the Handset/SPEAKER/Headset off-hook
• Select the LINE key associated with account
• Press OK key to display LCD: LINEx: PAGE.
• Dial the phone number you want to Page/Intercom
• Press SEND key.
NOTE: Dial-tone and dialed number display occurs after the handset is off-hook and the line key is selected.
The phone waits 4 seconds (by default; No key Entry Timeout) before sending and initiating the call. Press
the “SEND” or “#” button to override the 4 second delay.

Speed Dial
The Multi Purpose Key buttons, located on the right-hand-side of the phone, can be configured for speed
dial. Press the speed dial button to automatically call the assigned extension.
Note: The multi-functional buttons will function as LINE keys when all LINEs are busy. The LED will flash in
red to indicate an incoming call. Press the button to pick up the call. If any one of the Multi Purpose Keys is
associated with a call, the button’s speed dial/BLF function will not work.

Making Calls using IP Addresses
Direct IP Call allows two phones to talk to each other in an ad-hoc fashion without a SIP proxy. VoIP calls
can be made between two phones if:
• Both phones have public IP addresses, or
• Both phones are on a same LAN/VPN using private or public IP addresses, or
•

Both phones can be connected through a router using public or private IP addresses (with necessary
port forwarding or DMZ)

To make a direct IP call, please follow these steps:
1. Press MENU button to bring up MAIN MENU
2. Select “Direct IP Call” using the arrow-keys
3. Press OK to select
4. Input the 12-digit target IP address. (Please see example below)
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5. Press OK key to initiate call
To make a quick IP call, please see next section.
For example: If the target IP address is 192.168.1.60 and the port is 5062 (e.g. 192.168.1.60:5062), input
the following: 192*168*1*60#5062 - The “ * ” key represent the dot“.” ; The “#” key represent colon “:”. Press
OK to dial out.
Quick IP Call Mode
The GXP21xx also supports Quick IP call mode. This enables the phone to make direct IP-calls, using only
the last few digits (last octet) of the target phone’s IP-number. This is possible only if both phones are in
under the same LAN/VPN. This simulates a PBX function using the CMSA/CD without a SIP server.
Controlled static IP usage is recommended.

Setting up the phone to make Quick IP calls
To enable Quick IP calls, the phone has to be setup first. This is done through the web-setup function. In the
“Advanced Settings” page, set the "Use Quick IP-call mode to YES. When #xxx is dialed, where x is 0-9 and
xxx <=255, a direct IP call to aaa.bbb.ccc.XXX is completed. “aaa.bbb.ccc” is from the local IP address
regardless of subnet mask. The numbers #xx or #x are also valid. The leading 0 is not required (but OK).
For example:
192.168.0.2 calling 192.168.0.3 -- dial #3 follow by SEND or #
192.168.0.2 calling 192.168.0.23 -- dial #23 follow by SEND or #
192.168.0.2 calling 192.168.0.123 -- dial #123 follow by SEND or #
192.168.0.2: dial #3 and #03 and #003 results in the same call -- call 192.168.0.3
NOTE: If you have a SIP Server configured, a Direct IP-IP still works. If you are using STUN, the Direct IPIP call will also use STUN. Configure the “Use Random Port” to “NO” when completing Direct IP calls.

ANSWERING PHONE CALLS
Receiving Calls
1. Incoming single call: Phone rings with selected ring-tone. The corresponding account LINE flashes
red. Answer call by taking Handset/SPEAKER/Headset off hook or pressing SPEAKER or by
pressing the corresponding account LINE button.
2. Incoming multiple calls: When another call comes in while having an active call, the phone will
produce a Call Waiting tone (stutter tone). Next available lines will flash red (as described in section
4.3.2). Answer the incoming call by pressing its corresponding LINE button. The current active call
will be put on hold.
3. Paging/Intercom Enabled: Phone beeps once and automatically establishes the call via SPEAKER.
(PBX or Server must also supports this feature)

Do Not Disturb
Press the “DND” button to enable/disable “Do Not Disturb” (the corresponding icon will be on the right hand
side of the screen). When DND is enabled, the phone will not ring and send caller directly to voicemail.
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PHONE FUNCTIONS DURING A PHONE CALL
Call Waiting/ Call Hold
1. Hold: Place a call on hold by pressing the “HOLD” button.
2. Resume: Resume call by pressing the corresponding blinking LINE.
3. Multiple Calls: Automatically place ACTIVE call on “HOLD” by selecting another available LINE to
place or receive another call. Call Waiting tone (stutter tone) audible when line is in use.

Mute
1. Press the MUTE button to enable/disable muting the microphone.
2. The “Line Status Indicator” will show “LINEx: SPEAKING” or “LINEx: MUTE” to indicate whether the
microphone is muted.

Call Transfer
GXP21xx supports both Blind and Attended transfer:
1. Blind Transfer: Press “TRANSFER” button, then dial the number and press the “SEND” button to
complete transfer of active call.
2. Attended Transfer: Press “LINEx” button to make a call and automatically place the ACTIVE LINE
on HOLD. Once the call is established, press “TRANSFER” key then the LINE button of the waiting
line to transfer the call. Hang up the phone call after “Transfer Successful” is displayed in the screen.
NOTE: To transfer calls across SIP domains, SIP service providers must support transfer across SIP
domains. Blind transfer will usually use the primary account SIP profile.

5-Way Conferencing
GXP21xx can host conference calls and supports up to 5-way conference calling (Excludes GXP2100 which
supports up to 4-way).
1. Initiate a Conference Call:
 Establish a connection with two or more parties
 Press CONF button
 Choose the desired line to join the conference by pressing the corresponding LINE button
 Repeat previous two steps for all other parties that would like to join the conference. This
can be done at any time. However, if a new call comes in, the other calls will be placed on
hold and the host will have to individually re-join the held lines back into the conference by
repeating the previous two steps again
2. Cancel Conference: Canceling establishing conference call
 If after pressing the “CONF” button, a user decides not to conference anyone, press CONF
again or the original LINE button
 This will resume two-way conversation
3. End Conference:
 Press HOLD to end the conference call and put all parties on hold;
 To speak with an individual party, select the corresponding blinking LINE.
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NOTE: The party that starts the conference call has to remain in the conference for its entire duration, you
can put the party on mute but it must remain in the conversation. Also, this is not applicable when the feature
“Transfer on call hangup” is turned on.

Voice Messages (Message Waiting Indicator)
A blinking red MWI (Message Waiting Indicator) indicates a message is waiting. Press the Message button to
retrieve the message. An IVR will prompt the user through the process of message retrieval. Press a specific
LINE to retrieve messages for a specific line account.
NOTE:
• Each line has a separate voicemail account. Each account requires a voicemail portal number to be
configured in the “Voicemail User ID” field.
• To check which line account has a message 1) press the message button (this always checks the
primary account), 2) check each line for stutter tone or 3) check missed calls using the menu.

Busy Lamp Field
The Multi Purpose Key buttons can be configured for Busy Lamp Field function with a specified account.
When BLF is configured on one of the multi-functional buttons, the Speed Dial function will work when that
line is not in use. Call Pick Up is supported when user presses a flashing BLF key.

Shared Call Appearance (SCA)
The GXP21xx phone supports shared call appearance by Broadsoft standard. This feature allows members
of the SCA group to shared SIP lines and provides status monitoring (idle, active, progressing, hold) of the
shared line. When there is an incoming call designated for the SCA group, all of the members of the group
will be notified of an incoming call and will be able to answer the call from the phone with the SCA extension
registered.
All the users that belong to the same SCA group will be notified by visual indicator when a user seizes the
line and places an outgoing call, and all the users of this group will not be able to seize the line until the line
goes back to an idle state or when the call is placed on hold. (With the exception of when multiple call
appearances are enabled on the server side).
In the middle of the conversation, there are two types of hold: Public Hold and Private Hold. When a member
of the group places the call on public hold, the other users of the SCA group will be notified of this by the redflashing button and they will be able to resume the call from their phone by pressing the line button. However,
if this call is placed on private-hold, no other member of the SCA group will be able to resume that call.
To enable shared call appearance, the user would need to register the shared line account on one of the
accounts on the phone. In addition, they would need to navigate to “Settings”->”Basic Settings” on the web
UI and set the line to “Shared Line” with the corresponding account. If the user requires more shared call
appearances, the user can configure multiple line buttons to be “shared line” buttons associated with the
account.

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CALL FEATURES
The GXP21xx supports traditional and advanced telephony features including caller ID, caller ID w/name,
call forward/transfer/park/hold as well as intercom/paging and BLF.

Table 11: GXP21xx Call Features
Key

Call Features

*30

Block Caller ID (for all subsequent calls)

*31

Send Caller ID (for all subsequent calls)

*67

Block Caller ID (per call)

*82

Send Caller ID (per call)

*70

Disable Call Waiting (per Call)

*71

Enable Call Waiting (per Call)

*72

Unconditional Call Forward
Dial “*72” for a dial tone. Dial the forwarding number followed by “#”. Wait for dial
tone. LCD will display “Call FWD Activated”.

*73

Cancel Unconditional Call Forward: dial “*73” and get the dial tone, then hang up.
LCD will display “Call FWD Activated”.

*90

Busy Call Forward
Dial “*90” for a dial tone. Dial the forwarding number followed by “#”. Wait for a dial
tone. Hang up.

*91

Cancel Busy Call Forward: dial “*91”. Wait for dial tone. Hang up.

*92

Delayed Call Forward
Dial “*92” for a dial tone. Dial the forwarding number followed by “#”. Wait for a dial
tone. Hang up. LCD will display “Call FWD Activated”.

*93

Cancel Delayed Call Forward
Dial “*93” for a dial tone, then hang up.

CUSTOMIZED LCD SCREEN & XML
Grandstream GXP21xx Enterprise IP phone support both simple and advanced XML applications: 1) XML Custom
Screen, 2) XML Downloadable Phonebook and 3) Advanced XML Survey Application. For more information on
how to create a downloadable XML phonebook, creating a custom idle screen and/or reprogramming the soft-keys
on GXP21xx, please visit our website at: http://www.grandstream.com/support

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Configuration Guide
The GXP21xx can be configured in two ways. Firstly, using the Key Pad Configuration Menu on the phone;
secondly, through embedded web-configuration menu.

CONFIGURATION VIA KEYPAD
To enter the MENU, press the round button. Navigate the menu by using the arrow keys: up/down and left/right.
Press the OK button to confirm a menu selection. The phone automatically exits MENU mode with an incoming
call, the phone is off-hook or the MENU mode if left idle for 20 seconds.
Press the MENU button to enter the key the Key Pad Menu. The menu options available are listed in table 12.

Table 12: Key Pad Configuration Menu
Item

Description

Call History

Displays histories of answered, dialed, missed, and transferred and forwarded
calls

Status

Displays the network status, account status, software version, MAC-address and
hardware version of the phone

Phone Book

Displays the phonebook and downloads phonebook XML

LDAP Directory

Displays the LDAP directory and downloads directory

Instant Messages

Goes to instant messages

Direct IP Call

Dials IP address for direct IP call

Preference

Press Menu button to enter this sub menu including:
•
•
•
•
•
•
•
•

Grandstream Networks, Inc.

Do NOT Disturb
DND (Do Not Disturb) function could be turned on or off in the “Do Not
Disturb” menu.
Ring Tone
Choose different ring tones in the “Ring Tone” menu.
Ring Volume
Press Menu button to hear the selected ring volume, press “←” or “→”
to hear and adjust the ring tone volume.
LCD Contrast
Press “←” or “→” to adjust the LCD contrast.
LCD Brightness
Press “←” or “→” to adjust the LCD brightness for active/idle screen.
Download SCR XML
The phone will download the custom idle screen if available.
Erase Custom SCR
Custom idle screen will be erased and will be replaced with default
logo.
Display Language
You can choose English, Simplified Chinese, Traditional Chinese,
Korean, Japanese, Italian, Spanish, French, German, Portuguese,
Russian, Croatian, Hungarian, Polish, Slovenian which are built in the
phone. Users could select Automatic for local language based on IP
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•

location if available. Also, the phone will download secondary
language if available.
Time Settings

Press Menu button to choose the menu item
Press “←” or follow the soft keys to return to the main menu
Config

Press Menu button to display the configuration selections:
•
•

•

•

Factory Functions

SIP
To change SIP server settings for SIP accounts.
Upgrade
In this menu setting regarding the firmware server and Config server can
be changed. It also enables the user to make the phone attempt to
download new firmware.
Factory Reset
Key in the physical/MAC address on back of the phone.
Press Menu button to reset FACTORY DEFAULT setting. Do not use
Factory Reset unless you want to restore factory settings.
Layer 2 QoS
Configure 802.1Q/VLAN Tag and priority value.

Press Menu to display the factory function items including
• Audio Loopback
Speak into the handset. If you hear your voice in the handset, your audio
works fine. Press Menu button to exit the mode
• Diagnostic Mode
All LEDs will light up.
Press any key on the keypad, to display the button name in the LCD. Lift
and put back the handset or press Menu button to exit the diagnostic
mode.
Press “←” to return the main menu

Network

To enable/disable DHCP; to setup IP-address, Net mask and Gateway address

Reboot

Press Menu button to reboot the device

Exit

Exit from this menu

FIGURE 2: KEYPAD GUI FLOW

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Call History

MENU

Answered Calls
Dialed Calls
Missed Calls
Transferred Calls
Forwarded Calls

Any of previous menus
Back
Clear All

New Entry
Phone Book
New Entry
Download Phonebook XML
Back

Name:
Number:
Acct:
Confirm Add:
Cancel and Return:

LDAP Directory

Call History

Status

View Directory
Download Directory
Search Configuration
Back

Search Configuration
Select Filter
Filter Value
Back

Instant Message
Do Not Disturb

Phone Book

LDAP Directory

Instant
Message

Direct IP Call

Preference

Config

Factory
Functions

Clear All
Back
Preference
Do Not Disturb
Ring Tone
LCD Contrast
LCD Brightness
Download SCR XML
Erase Custom SCR
Display Language
Back

Default Ring
Ring1
Ring2
Ring 3
Back
LCD Brightness

SIP

SIP
Upgrade
Factory Reset
Layer 2 QoS
Back
Display Language
Factory Function

Reboot
Audio Loopback
Diagnostic Mode
Back

Network
IP Setting
PPPoE Settings
IP
Netmask
Gateway
DNS Server 1
DNS Server 2
Back

Grandstream Networks, Inc.

Ring Tone

Active
Idle
Back

Config

Network

Exit

Enable DND
Disable DND
Back

GXP21xx User Manual
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English
Chinese
French
Spanish
German
Italian
Secondary Language
Language File Postfix
Back
Diagnostic Mode

Account
SIP Proxy
Outbound
Proxy
SIP User ID
SIP Auth ID
SIP Password
SIP Transport
Audio
Save
Upgrade
Firmware
Server
Config Server
Upgrade Via
Layer 2 QoS

Keypad/LED Diagnostic

802.1Q/VLAN Tag
Priority value
Reset Vlan Config
Back

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CONFIGURATION VIA WEB BROWSER
The GXP21xx embedded Web server responds to HTTP/HTTPS GET/POST requests. Embedded HTML
pages allow a user to configure the IP phone through a Web browser such as Microsoft’s IE or Mozilla
Firefox, Google Chrome.

Access the Web Configuration Menu
To access the phone’s Web Configuration Menu
1
• Connect the computer to the same network as the phone
• Make sure the phone is turned on and shows its IP-address
• Start a Web-browser on your computer
• Enter the phone’s IP-address in the address bar of the browser2
• Enter the administrator’s password to access the Web Configuration Menu3
1

The Web-enabled computer has to be connected to the same sub-network as the phone. This can easily
be done by connecting the computer to the same hub or switch as the phone is connected to. In absence
of a hub/switch (or free ports on the hub/switch), please connect the computer directly to the phone using
the PC-port on the phone.

2

If the phone is properly connected to a working Internet connection, the phone will display its IP address.
This address has the format: xxx.xxx.xxx.xxx, where xxx stands for a number from 0-255. You will need
this number to access the Web Configuration Menu. e.g. if the phone shows 192.168.0.60, please use
“http://192.168.0.60” in the address bar your browser.

3

The default administrator password is “admin”; the default end-user password is “123”.

NOTE: When changing any settings, always SUBMIT them by pressing “UPDATE” button on the bottom of
the page. Reboot the phone to have the changes take effect. If, after having submitted some changes, more
settings have to be changed, press the menu option needed.

Definitions
This section will describe the options in the Web configuration user interface. As mentioned, a used can log
in as an administrator or end-user.
Functions available for the end-user are:
• Status: Displays the network status, account statuses, software version and MAC address of the
phone
• Basic: Basic preferences such as date and time settings, multi-purpose keys and LCD settings can
be set here.
Additional functions available to administrators are:
• Advanced Settings: To set advanced network settings, codec settings and XML configuration
settings.
• Account X: To configure each of the SIP accounts.
• EXT X: To configure setting on extension module (Not applicable on the GXP2100)

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Table 13: Device Configuration - Status
MAC Address

The device ID, in HEXADECIMAL format.

IP Address

This field shows IP address of GXP21xx.

Product Model

This field contains the product model information.

Part Number

This field contains the product part number.

Software Version

• Program: This is the main firmware release number, which is always used for
identifying the software (or firmware) system of the phone.
• Boot: Booting code version number
• Core: Core code version number
• Base: Base code version number
• DSP: DSP code version number
• Aux: Aux code version number

System Up Time

This field shows system up time since the last reboot.

System Time

This field shows the current time on the phone system.

Registered

Indicates whether accounts are registered to the related SIP server.

PPPoE Link Up

Indicates whether the PPPoE connection is enabled (connected to a modem).

Service Status

• GUI: shows the GUI status: running or stopped
• Phone: shows the phone status: running or stopped

Core Dump

Download core dump file for troubleshooting when necessary.

Table 14: Device Configuration – Settings/Basic Settings
End User Password

This contains the password to access the Web Configuration Menu. This field is case
sensitive with a maximum length of 25 characters.

IP Address

The GXP21xx operates in two modes:
1. DHCP mode: all the field values for the Static IP mode are not used (even
though they are still saved in the Flash memory.) The GXP21xx acquires its
IP address from the first DHCP server it discovers on its LAN. The DHCP
option is reserved for NAT router mode. To use the PPPoE feature, set the
PPPoE account settings. The GXP21xx establishes a PPPoE session if any
of the PPPoE fields is set.
2. PPPoE mode: configure all of the following fields: PPPoE account ID,
PPPoE password and PPPoE service name.
3. Static IP mode: configure all of the following fields: IP address, Subnet
Mask, Default Router IP address, DNS Server 1 (primary), DNS Server 2
(secondary). These fields are set to zero by default.

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802.1x Mode

This option allows the user to enable/disable 802.1x mode on the phone. The default
value is disabled. To enable 802.1x mode, this field should be set to EAP-MD5.
Once enabled, the user would be required to enter the following information below to
be authenticated on the network:
•
•

Line Keys x

Identity
MD5 Password

This allows the user to configure the account mapped to each line key, as well as
enabling SCA (Shared Call Appearance) for the line.
Options available for Key Mode are :
1. Line
2. Shared Line

Multi Purpose Key X

These options are used to assign a function to the corresponding multi purpose key.
Options available are:
1. Speed Dial.
2. BLF (Busy Lamp Field). This option has to be supported on the PBX and it
indicates the status of the extension. The three possible states are idle
(green), busy (red), ringing (blinking red).
3. Presence Watcher. This option has to be supported by a presence server
and it is tied to the “Do not disturb” status of the phone.
4. Eventlist BLF. This option is similar to the BLF option but in this case the PBX
collects the information from the phones and sends it out in one single notify
message. PBX has to support this feature.
Each function is connected to one of the accounts and has a target username and
user ID.

Time Zone

This parameter controls the date/time display according to the specified time zone.
If “Allow DHCP Option 2 to override Time Zone setting” is checked, the time zone will
be overridden by the DHCP server.

Self-Defined Time
Zone

This parameter allows the users to define their own time zone.
The syntax is: std offset dst [offset], start [/time], end [/time]
Default is set to: MTZ+6MDT+5,M3.2.0,M11.1.0
MTZ+6MDT+5,
This indicates a time zone with 6 hours offset with 1 hour ahead which is U.S central
time. If it is positive (+) if the local time zone is west of the Prime Meridian (A.K.A:
International or Greenwich Meridian) and negative (-) if it is east.
M3.2.0,M11.1.0
The 1st number indicates Month: 1,2,3.., 12 (for Jan, Feb, .., Dec)
The 2nd number indicates the nth iteration of the weekday: (1st Sunday, 3rd
Tuesday…)
The 3rd number indicates weekday: 0,1,2,..,6( for Sun, Mon, Tues,..,Sat)
Therefore, this example is the DST which starts from the second Sunday of March to
the 1st Sunday of November.

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Weather Update

By default, “Enable Weather Update:” is set to “Yes”. If set to “No”, weather
information will not display on the phone.
Settings to customize the display of weather via:
• City Code – Enter city code
• Update Interval – Refresh time in minutes
• Degree Unit – Select Automatic, Fahrenheit or Celsius
Weather information is displayed on GXP21xx LCD when “Enable Weather Update”
is set to “Yes” and pressing the “SwitchSCR” soft-key once.

Stock Update

By default, “Enable Stock Update:” is set to “Yes”. If set to “No”, stock information will
not display on the phone.
Settings to customize the display of stock via:
• Stock Code – Enter stock code
Stock information is displayed in GXP21xx LCD when “Enable Stock Update” is set to
“Yes” and pressing the “SwitchSCR” soft-key twice.

Currency Update

By default, “Enable Currency Update:” is set to “Yes”. If set to “No”, currency
information will not display on the phone.
Settings to customize the display of currency via:
• Currency Code – Enter currency code
Currency information (foreign currencies to US dollar) is displayed in GXP21xx LCD
when “Enable Currency Update” is set to “Yes” and pressing the “SwitchSCR” softkey three times.

LCD Backlight
Brightness

Set the LCD brightness level for idle state and active state. Range from 0 to 8 where
0 means off and 8 means the brightest.

LCD Contrast

Set LCD contrast. Range from 0 to 20.

Time Display Format

LCD time display in 12 hour or 24 hour format.

Disable in-call DTMF
display

Default is “No”. This field is used to hide the keypad input during a call.

Disable Missed Call
Backlight

Default is “No”. By default, LCD backlight will light up whenever there is a missed call.

HEADSET Key Mode

Default Mode:
- Toggle to Headset when using Speaker/Handset
- Dial, pick up call or hang up call using Headset
Toggle Headset/Speaker:
- toggle between using Headset and using Speaker

Headset TX gain (dB)

Set headset TX gain to -6, 0 or +6. Default is 0 db.

Headset RX gain (dB)

Set headset RX gain to -6, 0 or +6. Default is 0 db.

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Advanced User configuration includes not only the end user configuration, but also advanced configuration
such as SIP configuration, Codec selection, NAT Traversal Setting and other miscellaneous configuration.

Table 15: Device Configuration – Settings /Advanced Settings
Admin
Password

Administrator password. Only the administrator can access the “Advanced Settings”
and “Account Settings” page. Password field is purposely blank for security reasons
after clicking update and saved. The maximum password length is 25 characters.

Layer 3 QoS

This field defines the layer 3 QoS parameter. It is the value used for IP Precedence
or Diff-Serv or MPLS. Default value is 12.

Layer 2 QoS

This contains the value used for layer 2 802.1Q/VLAN tag and 802.1p priority value.
Default setting is 0.

Local RTP port

This parameter defines the local RTP-RTCP port pair used to listen and transmit. It
is the base RTP port for channel 0. When configured, channel 0 will use this port
_value for RTP and the port_value+1 for its RTCP; channel 1 will use port_value+2
for RTP and port_value+3 for its RTCP. Local RTP port ranges from 1024 to 65400
and must be even. The default value is 5004.

Use Random Port

This parameter, when set to “Yes”, will force random generation of both the local
SIP and RTP ports. This is usually necessary when multiple GXPs are behind the
same NAT. Default is “No”.

Keep-alive interval

This parameter specifies how often the GXP21xx sends a blank UDP packet to the
SIP server in order to keep the “hole” on the NAT open. Default is 20 seconds.

Use NAT IP

NAT IP address used in SIP/SDP message. Default is blank.

STUN Server

IP address or Domain name of the STUN server. STUN resolution result will display
in the STATUS page of the Web UI.

Firmware Upgrade and
Provisioning

Allows the user to select the following options for firmware upgrade:
• Always Check for New Firmware
• Check New Firmware only when F/W pre/suffix changes
• Always Skip the Firmware Check.
Firmware upgrade may take up to 10 minutes depending on network environment.
Do not interrupt the firmware upgrading process.
Note: Grandstream strongly recommends that the user upgrade firmware
locally in a LAN environment if using TFTP to upgrade. Please DO NOT
interrupt the upgrade process (especially the power supply) as this will
damage the device.

XML Config File
Password

The password used for encrypting the XML configuration file using OpenSSL. This
is required for the phone to decrypt the encrypted XML configuration file.

HTTP/HTTPS User Name The user name for the HTTP/HTTPS server.
HTTP/HTTPS Password

Grandstream Networks, Inc.

The password for the HTTP/HTTPS server.

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Upgrade Via

This field allows the user to choose the firmware upgrade method: TFTP, HTTP or
HTTPS.

Firmware Server Path

Defines the server path for the firmware server. It can be different from the
Configuration server which is used for provisioning.

Config Server Path

Defines the server path for provisioning; it can be different from the firmware server.

Firmware File
Prefix/Postfix

Default is blank. If configured, GXP21xx will request the firmware file with the
prefix/postfix and only the firmware with the matching encrypted prefix will be
downloaded and flashed into the phone.
This setting is useful for ITSPs. End user should keep it blank.

Config File
Prefix/Postfix

Default is blank. If configured, GXP21xx will request the config file with the
prefix/postfix and only the file with the matching encrypted prefix will be downloaded
and flashed into the phone.
This setting is useful for ITSPs. End user should keep it blank.

Allow DHCP Option 43
and Option 66 to
override server

Default is “Yes”. This allows device gets provisioned from the server automatically.

Automatic Upgrade

This function is used by ITSP. End user should NOT touch these parameters.
Default is “No”. Choose “Yes” to enable automatic HTTP upgrade and provisioning.
In “Check for upgrade every” field, enter the number of minutes to check the HTTP
server for firmware upgrade or configuration changes. When set to “No”, the phone
will only perform HTTP upgrade and configuration check once at boot up.

Authenticate Conf File

Default is “No”. If set to “Yes”, configuration file would be authenticated before
acceptance. End user should use default setting.

Enable TR-069

Default is “No”.

ACS URL

URL for TR-069 Auto Configuration Servers (ACS).

TR-069 Username

Enter username for TR-069.

TR-069 Password

Enter password for TR-069.

Save Credentials

Save TR-069 credentials. Default is “No”.

Auto Login

Auto Login TR-069 account. Default is “No”.

Periodic Inform Enable

Enable periodic inform. Default is “No”.

Periodic Inform Interval

When enabling periodic inform, set up the periodic inform interval.

Connection Request
Username

Enter the connection request username.

Connection Request
Password

Enter the connection request password.

Authentication Method

Select the authentication method among “No authentication”, “Basic” or Digest.

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Connection Request
Port

Enter the connection request port.

Phonebook XML
Download

Selects the file download mode for the download server. Users can choose from
TFTP/HTTP/No.

Phonebook XML Server
Path

The URL/IP address of the phonebook download server.

Phonebook Download
Interval

The interval at which the phonebook will be downloaded from the download server
(in Minutes). The default setting is 0.

Remove Manually-edited If set to “Yes”, the phone will remove the manually-edited entries in the old
entries on Downloads
phonebook list before downloading the new file. The default setting is set to “Yes”.
LDAP Directory

IP address or domain name of LDAP script server.

Idle Screen XML
Download

Enable XML Idle Screen download via TFTP or HTTP. Select whether to “Use
Custom Filename” or not, and define the “XML server path”.

Download Screen XML
At Boot-up:

The phone will download the idle screen xml file if set to “Yes”. The default setting
is “No”.

Use custom filename:

The phone will use custom filename specified in XML server path if set to “Yes”.
The default setting is “No”.

Idle Screen XML Server
Path:

Specify the idle screen XML server path.

XML Application

Server path: enter server path for XML application.
Softkey Label: define the softkey label for the XML application.

Offhook Auto Dial

To configure a User ID/extension to dial automatically when the phone is taken
offhook.

Syslog Server

The IP address or URL of System log server. This feature is especially useful for
ITSPs.

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Syslog Level

Select the ATA to report the log level. Default is NONE. The level is one of DEBUG,
INFO, WARNING or ERROR. Syslog messages are sent based on the following
events:
• product model/version on boot up (INFO level)
• NAT related info (INFO level)
• sent or received SIP message (DEBUG level)
• SIP message summary (INFO level)
• inbound and outbound calls (INFO level)
• registration status change (INFO level)
• negotiated codec (INFO level)
• Ethernet link up (INFO level)
• SLIC chip exception (WARNING and ERROR levels)
• memory exception (ERROR level)
The Syslog uses USER facility. In addition to standard Syslog payload, it contains
the following components: GS_LOG: [device MAC address][error code] error
message.
For example: May 19 02:40:38 192.168.1.14 GS_LOG: [00:0b:82:00:a1:be][000].
Ethernet link is up.

Send SIP Log

When setting the “Yes”, phone will send out SIP Log to syslog server. Default
setting is “No”.

NTP server

This parameter defines the URI or IP address of the NTP (Network Time Protocol)
serve. It is used to display the current date/time.

Allow DHCP Option 42
to override NTP server

Default is “Yes”. This allows device gets provisioned for DHCP Option 42 from the
server automatically.

SSL Certificate

This defines the SSL certificate needed to access certain websites.

SSL Private Key

This defines the SSL Private key.

SSL Private Key
Password

This defines the SSL private key password.

Distinctive Ring Tone

Caller ID must be configured. Select a Distinctive Ring Tone 1 through 3 for a
particular Caller ID. The GXP21xx will ONLY use selected ring tones for particular
Caller IDs. For all other calls, the GXP21xx will use System Ring Tone. When
selected and no Caller ID is configured, the selected ring tone will be used for all
incoming calls.

System Ring Tone

System ring tone. Default is North American standard.
Adjust system ring tone frequencies and cadences based on local telecom
standard.

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Call Progress Tones

Using these settings, users can configure ring or tone frequencies based on
parameters from local telecom. By default, they are set to North American standard.
Frequencies should be configured with known values to avoid uncomfortable high
pitch sounds.
Syntax: f1=val,f2=val[,c=on1/off1[-on2/off2[-on3/off3]]];
(Frequencies are in Hz and cadence on and off are in 10ms)
ON is the period of ringing (“On time” in “ms”) while OFF is the period of silence. In
order to set a continuous ring, OFF should be zero. Otherwise it will ring ON ms
and a pause of OFF ms and then repeat the pattern. Up to three cadences are
supported.

Intercom User ID

Configure intercom user ID when intercom is used.

Disable Call Waiting

Default is “No”. If set to “Yes”, the call waiting feature will be disabled.

Disable Call
Waiting Tone

Default is “No”. If set to “Yes”, the call waiting tone will be disabled.

Disable Direct IP Calls

Default is “No”. If set to “Yes”, direct IP calls will be disabled.

Use Quick IP Call Mode

Dial an IP address under the same LAN/VPN segment by entering the last octet in
the IP address.
In the Advanced Settings page there is an option “Use Quick IP-call mode”. Default
setting is “No”. When set to “Yes”, and #XXX is dialed, where X is 0-9 and XXX
<=255, phone will make direct IP call to aaa.bbb.ccc.XXX where aaa.bbb.ccc
comes from the local IP address REGARDLESS of subnet mask.
#XX or #X are also valid so leading 0 is not required (but OK). See Quick IP Call
Mode for details.

Disable Conference

Default is “No”. If set to “Yes”, conference will be disabled.

Enable MPK Sending
DTMF

Default is No. If set to “Yes”, Muti-Purpose keys can be sent as DTMF.

Disable DND Button

Default is “No”. If set to “Yes”, the “DND” button on keypad will be disabled.

Disable Transfer

Default is “No”. If set to “Yes”, transfer will be disabled.

Auto-Attended Transfer

Default is “No”. If set to “Yes”, the phone will use attended transfer by default.

Configuration via
Keypad Menu

Configures the access control of configurations via the phone keypad menu. There
are three modes:
• Unrestricted
• Basic Settings Only
• Constraint Mode

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Display Language

Allows user to choose preferred display language in web UI and key pad UI.
Currently, the phone supports these languages: English, Simplified Chinese,
Traditional Chinese, Korean, Japanese, Italian, Spanish, French, German,
Portuguese, Russian, Croatian, Hungarian, Polish and Slovenian.
Note: The “Automatic” setting in language refers to Grandstream’s IP2Location
client which when connected to Internet would attempt to lookup a database
(driven by Grandstream) with the IP address for its geographical location.
Language file postfix allows the language file to have different postfixes so the
phone can request a particular file. It will append an underscore "_" plus the string
in the language file postfix.
The default language file name is "gxp.txt". If the field “Language File postfix “has
"NL" string in it, then the phone will request "gxp_NL.txt" instead of "gxp.txt".
User can only load one secondary language.
Supported downloadable language: Czech, Dutch, Estonian, French, German,
Italian, Polish, Portuguese, Slovak, Slovenian and Spanish.
How to set up Download Language:
This is similar to updating firmware in your local network environment.
1. Get the language file gxp.txt ready. Make sure the file is using UTF-8 encoding.
2. Copy gxp.txt to the firmware server directory using your local TFTP or HTTP
server.
3. Access the advanced settings of the Web GUI, set “Display Language” to
“Download Language” and enter the server path in Firmware Server Path. Select
TFTP or HTTP for firmware upgrade.
4. Update and reboot the phone.

GXP21xx has up to six line appearances, each with an independent SIP account. Each SIP account requires
its own configuration page. Their configurations are identical.
Table 16: SIP Account Settings
Account Active

This field indicates whether the account is active. The default value is “Yes”.

Account Name

The name associated with each account - displayed on LCD.

SIP Server

SIP Server’s IP address or Domain name provided by VoIP service provider.

Secondary SIP Server

This field allows administrator to configure a backup SIP Server.

Outbound Proxy

IP address or Domain name of Outbound Proxy, Media Gateway, or Session Border
Controller. Used for firewall or NAT penetration in different network environment. If
the system detects symmetric NAT, STUN will not work. ONLY outbound proxy can
provide solution for symmetric NAT.

SIP User ID

User account information provided by VoIP service provider (ITSP); either an actual
phone number or formatted like one.

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Authenticate ID

SIP service subscriber’s Authenticate ID used for authentication. It can be identical
to or different from SIP User ID.

Authenticate Password

SIP service subscriber’s account password for GXP21xx to register to (SIP) servers
of ITSP.

Name

SIP service subscriber’s name that is used for Caller ID display.

DNS Mode

The default is set to A Record. If user wishes to locate the server by DNS SRV,
the user may select SRV or NATPTR/SRV. When "Use Configured IP" option is
selected, if SIP server is configured as domain name, phone will not send DNS
query, but use "Primary IP" or "Secondary IP" to send sip message if at least one
of them are not empty.

Primary IP

This option applies only if “Use Configured IP” is selected, the phone will send DNS
query to the Primary IP. Insert IP address here.

Backup IP 1

Insert the first back up IP here.

Backup IP 2

Insert the second back up IP here.

SIP Registration

This parameter controls sending REGISTER messages to the proxy server. The
default setting is “Yes”.

Unregister on Reboot

Default is “No”. If set to “Yes”, the SIP user’s registration information will be cleared
on reboot.

Register Expiration

This parameter allows user to specify the time frequency (in minutes) that GXP21xx
refreshes its registration with the specified registrar. The default interval is 60
minutes. The maximum interval is 65,535 minutes (about 45 days).

Local SIP Port

This parameter defines the local SIP port used to listen and transmit. The default
value for Account 1 is 5060. It is 5062, 5064, 5066 for Account 2, Account 3 and
Account 4 respectively.

SIP Registration Failure Retry registration if the process failed. Default is 20 seconds.
Retry Wait Time
SIP T1 Timeout

RFC 3261 SIP T1 timer. Default is 0.5 second.

SIP T2 Interval

RFC 3261 SIP T2 timer. Default is 4 seconds.

SIP Transport

Choose SIP Transport between UDP and TCP. Default is UDP.

Check Domain
Certificate

Enable to check the domain certificate. Default is “No”.

Remove OBP from
Route

The SIP Extension notifies the SIP server that it is behind a NAT/firewall.

Validate Incoming
Messages

This configuration selects whether or not the incoming messages should be
validated.

Support SIP Instance ID Selects whether or not SIP Instance ID is supported.

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NAT Traversal

This parameter activates the NAT traversal mechanism. It has options: No, STUN,
Keep-Alive, UPnP, Auto, VPN.
If selecting STUN and a STUN server is also specified, the phone performs
according to the STUN client specification. Using this mode, the embedded STUN
client detects if and what type of NAT/Firewall configuration is used. If the detected
NAT is a Full Cone, Restricted Cone, or a Port-Restricted Cone, the phone will use
its mapped public IP address and port in all of its SIP and SDP messages.
If selecting Keep-Alive with no specified STUN server, the GXP21xx will periodically
(every 20 seconds or so) send a blank UDP packet (with no payload data) to the
SIP server to keep the “hole” on the NAT open.

SUBSCRIBE for MWI

Default is “No”. When set to “Yes” a SUBSCRIBE for Message Waiting Indication
will be sent periodically.

PUBLISH for Presence

Enable Presence feature.

Proxy-Require

SIP Extension to notify SIP server that the unit is behind the NAT/Firewall.

Voice Mail UserID

When configured, user can access messages by pressing “MSG” button. This ID is
usually the VM portal access number.

Send DTMF

This parameter specifies the mechanism to transmit DTMF digit. There are 3
supported modes: in audio which means DTMF is combined in audio signal (not
very reliable with low-bit-rate codec), via RTP (RFC2833), or via SIP INFO.

DTMF Payload Type

Sends DTMF using RFC2833. The default is 101.

Early Dial

Default is “No”. Use only if proxy supports 484 responses.

Dial Plan Prefix

Sets the prefix added to each dialed number.

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Dial Plan

Dial Plan Rules:
1. Accepted Digits: 1,2,3,4,5,6,7,8,9,0 , *, #, A,a,B,b,C,c,D,d
2. Grammar: x - any digit from 0-9;
a) xx+ - at least 2 digit numbers
b) xx. - only 2 digit numbers
c) ^ - exclude
d) [3-5] - any digit of 3, 4, or 5
e) [147] - any digit of 1, 4, or 7
f) <2=011> - replace digit 2 with 011 when dialing
g) | - the OR operand
• Example 1: {[369]11 | 1617xxxxxxx}
Allow 311, 611, and 911 or any 10 digit numbers with leading digits 1617
• Example 2: {^1900x+ | <=1617>xxxxxxx}
Block any number of leading digits 1900 or add prefix 1617 for any dialed 7 digit
numbers
• Example 3: {1xxx[2-9]xxxxxx | <2=011>x+}
Allows any number with leading digit 1 followed by a 3 digit number, followed by any
number between 2 and 9, followed by any 7 digit number OR Allows any length of
numbers with leading digit 2, replacing the 2 with 011 when dialed.
3. Default: Outgoing – {x+}
Allow any length of numbers.
Example of a simple dial plan used in a Home/Office in the US:
{ ^1900x. | <=1617>[2-9]xxxxxx | 1[2-9]xx[2-9]xxxxxx | 011[2-9]x. | [3469]11 }
Explanation of example rule (reading from left to right):
• ^1900x. - prevents dialing any number started with 1900
• <=1617>[2-9]xxxxxx - allows dialing to local area code (617) numbers by dialing
7 numbers and 1617 area code will be added automatically
• 1[2-9]xx[2-9]xxxxxx |- allows dialing to any US/Canada Number with 11 digits
length
• 011[2-9]x. - allows international calls starting with 011
• [3469]11 - allow dialing special and emergency numbers 311, 411, 611 and 911
Note: In some cases where the user wishes to dial strings such as *123 to activate
voice mail or other applications provided by their service provider, the * should be
predefined inside the dial plan feature. An example dial plan will be: { *x+ } which
allows the user to dial * followed by any length of numbers.

Delayed Call Forward
Wait Time

Time waited before the call is forward to a number or VM.
Default is 20 seconds.

Enable Call Features

Default is “Yes”. If set to “No”, Call transfer, Call Forwarding & Do-Not-Disturb are
supported locally provided ITSP support those features. In addition, “ForwardAll”
softkey will be hidden if call feature code is disabled for Account 1.

Call Log

User can choose to disable Call Log and what kind of calls to log.

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Session Expiration

The SIP Session Timer extension enables SIP sessions to be periodically
“refreshed” via a SIP request (UPDATE, or re-INVITE. Once the session interval
expires, if there is no refresh via a UPDATE or re-INVITE message, the session is
terminated.
Session Expiration is the time (in seconds) at which the session is considered timed
out, provided no successful session refresh transaction occurs beforehand. The
default value is 180 seconds.

Min-SE

Defines the minimum session expiration (in seconds). Default is 90 seconds.

Caller Request Timer

If set to “Yes”, the phone will use session timer when it makes outbound calls if
remote party supports session timer.

Callee Request Timer

If selecting “Yes”, the phone will use session timer when it receives inbound calls
with session timer request.

Force Timer

If set to “Yes”, the phone will use session timer even if the remote party does not
support this feature. If set to “No”, the session timer is enabled only when the
remote party supports this feature. To turn off Session Timer, select “No” for Caller
Request Timer, Callee Request Timer, and Force Timer.

UAC Specify Refresher

As a Caller, select UAC to use the phone as the refresher, or UAS to use the Callee
or proxy server as the refresher.

UAS Specify Refresher

As a Callee, select UAC to use caller or proxy server as the refresher, or UAS to
use the phone as the refresher.

Force INVITE

Session Timer can be refreshed using INVITE method or UPDATE method. Select
“Yes” to use INVITE method to refresh the session timer.

Enable 100rel

PRACK (Provisional Acknowledgment) method enables reliability to SIP provisional
responses (1xx series). This is required to support PSTN inter-networking.

Account Ring Tone

There are 4 uniquely defined ring tones:
• One (1) System Ring Tone: when selected, all calls will ring with system
ring tone.
• Three (3) Customer Ring Tones: when selected, incoming calls from
designated account will play selected ring tone.

Ring Timeout

Defines how long the phone will ring when receiving a call. Default is 60 seconds.

Send Anonymous

If this parameter is set to “Yes”, the “From” header in outgoing INVITE message will
be set to anonymous, essentially blocking the Caller ID from displaying.

Anonymous Call
Rejection

Default is “No”. If set to “Yes”, anonymous call will be rejected.

Auto Answer

Default is “No”. If set to “Yes”, GXP21xx will automatically switch on speaker to
answer the incoming call. Set to Intercom/Paging mode, it will answer the call based
on the SIP info header from the server.

Allow Auto Answer by
Call-Info

If the Call-Info header contains answer-after=0, the call be answered automatically
(so called paging mode).

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Refer-To Use Target
Contact

Default is “No”. If set to “Yes”, then for Attended Transfer, the “Refer-To” header
uses the transferred target’s Contact header information.

Transfer on Conference Defines whether or not the call is transferred to the other party if the initiator of the
Hangup
conference hangs up.
Default setting is set to “No”.
Preferred Vocoder

GXP21xx supports up to 7 different Vocoder types including G.711(a/µ) (also known
as PCMU/PCMA), G.723.1, G.729A/B, G.726-32, iLBC, G.722 (wide-band).
Configure Vocoders in a preference list that is included with the same preference
order in SDP message. Enter the first Vocoder in this list by choosing the
appropriate option in “Choice 1”. Similarly, enter the last Vocoder in this list by
choosing the appropriate option in “Choice 8”.

SRTP Mode

Enable SRTP mode based on selection. Default is “No”.

Symmetric RTP

Selects whether or not symmetric RTP is supported.

Silence Suppression

This controls the silence suppression/VAD feature of the audio codec G.723 and
G.729. If set to “Yes”, when silence is detected, a small quantity of VAD packets
(instead of audio packets) will be sent during the period of no talking. If set to “No”,
this feature is disabled.

Voice Frames per TX

This field contains the number of voice frames to be transmitted in a single Ethernet
packet (be advised the IS limit is based on the maximum size of Ethernet packet is
1500 byte (or 120kbps)).
When setting this value, be aware of the requested packet time (ptime, used in SDP
message) is a result of configuring this parameter. This parameter is associated
with the first codec in the above codec Preference List or the actual used payload
type negotiated between the 2 conversation parties at run time. E.g., if the first
codec is configured as G.723 and the “Voice Frames per TX” is set to 2, then the
“ptime” value in the SDP message of an INVITE request will be 60ms because each
G.723 voice frame contains 30ms of audio. Similarly, if this field is set to 2 and the
first codec is G.729 or G.711 or G.726, then the “ptime” value in the SDP message
of an INVITE request will be 20ms.
If the configured voice frames per TX exceeds the maximum allowed value, the IP
phone will use and save the maximum allowed value for the corresponding first
codec choice. The maximum value for PCM is 10 (x10ms) frames; for G.726, it is 20
(x10ms) frames; for G.723, it is 32 (x30ms) frames; for G.729/G.728, 64 (x10ms)
and 64 (x2.5ms) frames respectively.
Please be careful when editing these parameters. Adjusting these parameters will
also change the dynamic jitter buffer. The GXP21xx has a patent dynamic jitter
buffer handling algorithm. The jitter buffer range is 20 ~ 200 ms.
We recommend using the default settings provided. We do not recommend
adjusting these parameters if you are an average user. Incorrect settings will affect
the voice quality.

No Key Entry Timeout

Grandstream Networks, Inc.

Default is 4 seconds. After the timeout, the phone will send out the dialed number.

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Use # as Dial Key

This parameter allows users to configure the “#” key as the “Send” (or “Dial”) key. If
set to “Yes”, the “#” key will immediately send the call. In this case, this key is
essentially equivalent to the “(Re)Dial” key. If set to “No”, the “#” key is included as
part of the dial string.

G723 Rate

Encoding rate for G723 codec. By default, 6.3kbps rate is set.

G726-32 Packing Mode

Select “ITU” or “IETF” for G726-32 packing mode.

iLBC Frame Size

iLBC packet frame size. Default is 20ms. For Asterisk PBX, 30ms might be
required.

iLBC Payload Type

Payload type for iLBC. Default value is 97. The valid range is between 96 and 127.

eventlist BLF URI

If the server supports this feature, user needs to configure an "eventlist BLF" URI on
the service side (i.e.: BLF1006@myserver.com)
On the GXP21xx, under Account page, fill in the ""eventlist BLF" field with the URI
without the domain. (i.e.: BLF1006). Under Basic Settings, please select "eventlist
BLF" in the Multi Purpose Key then choose account number, enter username and
user id.

Special Feature

Default is Standard. Choose the selection to meet special requirements from Soft
Switch vendors.

SAVING THE CONFIGURATION CHANGES
After the user makes a change to the configuration, press the “Update” button in the Configuration Menu.
The web browser will then display a message window to confirm saved changes.
We recommend rebooting or powering cycle the IP phone after saving changes.

REBOOTING THE PHONE REMOTELY
Press the “Reboot” button at the bottom of the configuration menu to reboot the phone remotely. The web
browser will then display a message window to confirm that reboot is underway. Wait 30 seconds to log in
again.

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Software Upgrade & Customization
Software (or firmware) upgrades are completed via either TFTP or HTTP. The corresponding configuration
settings are in the ADVANCED SETTINGS configuration page.

FIRMWARE UPGRADE THROUGH TFTP/HTTP
To upgrade via TFTP or HTTP, select TFTP or HTTP upgrade method. “Upgrade Server” needs to be set to
a valid URL of a HTTP server. Server name can be in either FQDN or IP address format. Here are examples
of some valid URLs.
•
•

firmware.mycompany.com:6688/Grandstream/1.2.3.5
72.172.83.110

There are two ways to set up the Upgrade Server to upgrade firmware: via Key Pad Menu or Web
Configuration Interface.

Key Pad Menu
To configure the Upgrade Server via Key Pad Menu options, select “Config” from the Main Menu, then select
“Upgrade”. Under this sub Menu, user can edit Upgrade Server in either an IP address format or FQDN
format. Choose “Save and use TFTP” or “Save and use HTTP” to select upgrade method. Select “Reboot”
from the Main Menu to reboot the phone.

Web Configuration Interface
To configure the Upgrade Server via the Web configuration interface, open the web browser. Enter the
GXP21xx IP address. Enter the admin password to access the web configuration interface. In the
ADVANCED SETTINGS page, enter the Upgrade Server’s IP address or FQDN in the “Firmware Server
Path” field. Select TFTP or HTTP upgrade method. Update the change by clicking the “Update” button.
“Reboot” or power cycle the phone to update the new firmware.
During this stage, the LCD will display the firmware file downloading process. Please do NOT disrupt or
power down the unit. If a firmware upgrade fails for any reason (e.g., TFTP/HTTP server is not responding,
there are no code image files available for upgrade, or checksum test fails, etc), the phone will stop the
upgrading process and re-boot using the existing firmware/software.
Firmware upgrades take around 60 seconds in a controlled LAN or 5-10 minutes over the Internet. We
recommend completing firmware upgrades in a controlled LAN environment whenever possible.

No Local TFTP/HTTP Server
For users who do not have a local TFTP/HTTP server, we provide a HTTP server on the public Internet for
users to download the latest firmware upgrade automatically. Please check the Support/Download section of
our website to obtain this HTTP server IP address: http://www.grandstream.com/support/firmware.
Alternatively, download and install a free TFTP or HTTP server to the LAN to perform firmware upgrades. A
free Windows version TFTP server is available:
http://support.solarwinds.net/updates/New-customerFree.cfm.
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INSTRUCTIONS FOR LOCAL TFTP UPGRADE:
1. Unzip the file and put all of them under the root directory of the TFTP server.
2. The PC running the TFTP server and the GXP21xx should be in the same LAN segment.
3. Go to File -> Configure -> Security to change the TFTP server's default setting from
"Receive Only" to "Transmit Only" for the firmware upgrade.
4. Start the TFTP server, in the phone’s web configuration page
5. Configure the Firmware Server Path with the IP address of the PC
6. Update the change and reboot the unit
User can also choose to download the free HTTP server from http://httpd.apache.org/ or use Microsoft IIS
web server.
NOTE:
• When GXP21xx phone boots up, it will send TFTP or HTTP request to download configuration file
“cfg000b82xxxxxx”, where “000b82xxxxxx” is the MAC address of the GXP21xx phone. This file is
for provisioning purpose. For normal TFTP or HTTP firmware upgrades, the following error
messages in a TFTP or HTTP server log can be ignored: “TFTP Error from [IP ADRESS] requesting
cfg000b82023dd4 : File does not exist.Configuration File Download”

CONFIGURATION FILE DOWNLOAD
The GXP21xx can be configured via Web Interface as well as via Configuration File (binary or XML) through
TFTP or HTTP/HTTPS. The “Config Server Path” is the TFTP or HTTP server path for the configuration file.
It needs to be set to a valid URL, either in FQDN or IP address format. The “Config Server Path” can be the
same or different from the “Firmware Server Path”.
A configuration parameter is associated with each particular field in the web configuration page. A parameter
consists of a Capital letter P and 2 to 4 digit numeric numbers, i.e., P2 is associated with “Admin Password”
in the ADVANCED SETTINGS page. For a detailed parameter list, please refer to the corresponding
configuration template of the firmware.
Once the GXP21xx boots up (or re-booted), it will request a configuration file named “cfgxxxxxxxxxxxx”
followed by a request for configuration XML file named “cfgxxxxxxxxxxxx.xml”, where “xxxxxxxxxxxx” is the
MAC address of the device, i.e., “cfg000b820102ab”. The configuration file name should be in lower cases.
For more details on XML provisioning, please refer to http://www.grandstream.com/support.

Managing Firmware and Configuration File Download
When “Automatic Upgrade” is set to “Yes”, a Service Provider can use P193 (Auto Check Interval, in
minutes, default and minimum is 60 minutes) to have the devices periodically check for upgrades at prescheduled time intervals. By defining different intervals in P193 for different devices, a Server Provider can
manage and reduce the Firmware or Provisioning Server load at any given time.

Grandstream Networks, Inc.

GXP21xx User Manual
Firmware version: 1.0.1.66

Page 40 of 41
Last Updated: 05/2011

Restore Factory Default Setting
WARNING: Restoring the Factory Default Setting will delete all configuration information of the phone.
Please backup or print all the settings before you restoring factory default settings. We are not responsible
for restoring lost parameters and cannot connect your device to your VoIP service provider.

INSTRUCTIONS FOR RESTORATION:
Step 1: Press “OK” button to bring up the keypad configuration menu, select “Config”, press “OK” to
enter submenu, select “Factory Reset” (Please refer to Table 5-1 of keypad flow chart)
Step 2: Enter the MAC address printed on the bottom of the sticker. Please use the following mapping:
0-9:
A:
B:
C:
D:
E:
F:

0-9
22 (press the “2” key twice, “A” will show on the LCD)
222
2222
33 (press the “3” key twice, “D” will show on the LCD)
333
3333

Example: if the MAC address is 000b8200e395, it should be key in as “0002228200333395”.
NOTE: If there are digits like “22” in the MAC, you need to type “2” then press “->” right arrow key to
move the cursor or wait for 4 seconds to continue to key in another “2”.
Step 3: Press the “OK” button to move the cursor to “OK”. Press “OK” button again to confirm. If the
MAC address is correct, the phone will reboot. Otherwise, it will exit to previous keypad menu interface.

Grandstream Networks, Inc.

GXP21xx User Manual
Firmware version: 1.0.1.66

Page 41 of 41
Last Updated: 05/2011



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