Grandstream Networks GXP2124 User manual

Grandstream Networks, Inc.
GXP2124 SIP Enterprise Phones

Grandstream Networks, Inc. GXP2124 User Manual_1.0.0.01 Page 2 of 38
TABLE OF CONTENTS
EQUIPMENT PACKAGING.............................................................................................................................................5
CONNECTING YOUR PHONE ........................................................................................................................................5
SAFETY COMPLIANCES................................................................................................................................................5
WARRANTY.................................................................................................................................................................6
GETTING FAMILIAR WITH THE LCD..........................................................................................................................11
MAKING PHONE CALLS.............................................................................................................................................14
ANSWERING PHONE CALLS.......................................................................................................................................17
PHONE FUNCTIONS DURING A PHONE CALL .............................................................................................................17
CALL FEATURES........................................................................................................................................................18
CUSTOMIZED LCD SCREEN &XML.........................................................................................................................19
CONFIGURATION VIA KEYPAD..................................................................................................................................19
CONFIGURATION VIA WEB BROWSER ......................................................................................................................23
SAVING THE CONFIGURATION CHANGES...................................................................................................................34
REBOOTING THE PHONE REMOTELY .........................................................................................................................34
FIRMWARE UPGRADE THROUGH TFTP/HTTP..........................................................................................................35
CONFIGURATION FILE DOWNLOAD ...........................................................................................................................36
TABLE OF FIGURES
GXP2124 USER MANUAL
Table 10: GXP2124 Keypad Buttons ............................................................................................ 13
Table 10: GXP2124 Keypad Buttons ............................................................................................ 13
Figure 3: Keypad GUI Flow............................................................................................................ 22
TABLE OF TABLES
GXP2124 USER MANUAL
Table 1: Equipment Packaging ....................................................................................................... 5
Table 2: GXP2124 Connectors ....................................................................................................... 5
Table 3: GXP2124 Product Models ................................................................................................. 7
Table 4: GXP2124 Comparison Guide............................................................................................ 7
Table 5: GXP2124 Key Features in a Glance................................................................................. 7
Table 6: GXP2124 Hardware Specifications................................................................................... 8
Table 7: GXP2124 Technical Specifications................................................................................... 8
Table 8: LCD Buttons.................................................................................................................... 11
Table 9: LCD Icons ....................................................................................................................... 11

Grandstream Networks, Inc. GXP2124 User Manual_1.0.0.01 Page 3 of 38
Table 11: GXP2124 Call Features ................................................................................................18
Table 12: Key Pad Configuration Menu ........................................................................................ 19
Table 13: Device Configuration - Status ....................................................................................... 24
Table 14: Device Configuration – Basic Settings.......................................................................... 24
Table 15: Advanced Settings ........................................................................................................ 25
Table 16: SIP Account Settings .................................................................................................... 30
GUI INTERFACE EXAMPLES
GXP2124 USER MANUAL
(http://www.grandstream.com/support/gxp_series/general/documents/gxp_gui.zip)
1. SCREENSHOT OF CONFIGURATION LOGIN PAGE
2. SCREENSHOT OF STATUS PAGE
3. SCREENSHOT OF BASIC SETTINGS CONFIGURATION PAGE
4. SCREENSHOT OF ADVANCED USER CONFIGURATION PAGE
5. SCREENSHOT OF SIP ACCOUNT CONFIGURATION
6. SCREENSHOT OF SAVED CONFIGURATION CHANGES
7. SCREENSHOT OF REBOOT PAGE

Grandstream Networks, Inc. GXP2124 User Manual_1.0.0.01 Page 4 of 38
Welcome
Your Grandstream GXP2124 IP phone features a new sophisticated design and is very easy to use. The
GXP22124 combines advanced feature functionality with the latest technology to offer excellent audio
quality, ease of use, expandability, and broad interoperability with 3rd party SIP platforms. It is ideal for
the enterprise customer.
The GXP2124 supports a broad range of codecs, security protection, PoE, dual 10/100mbps Ethernet
ports and are very easy to manage. Delivers superior audio quality using a handset, hands-free
speakerphone or headset and supports multi-party conferencing, multi-languages, dual-color LEDs,
presence and BLF. Large easy-to-read backlit graphical displays with multiple XML keys further enhance
the user experience. GXP2124 are expandable with two expansion module (pending for software).
The series is based on SIP standard and are interoperable with most 4rd party SIP platforms and open-
source platforms.
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 GXP2124 as it may cause damage to
the products and void the manufacturer warranty.
•This document is contains links to Grandstream GUI Interfaces. Please download these examples
from http://www.grandstream.com/support/gxp_series/general/documents/gxp_gui.zip for your
reference.
•This document is subject to change without notice. The latest electronic version of this user manual
is available for download @:
http://www.grandstream.com/support/gxp_series/general/documents/gxp_usermanual_english.pdf
•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. GXP2124 User Manual_1.0.0.01 Page 5 of 38
Installation
EQUIPMENT PACKAGING
Table 1: Equipment Packaging
GXP-2124
Main Case Yes
Handset Yes
Phone Cord Yes
Power Adaptor Yes
Ethernet Cable Yes
High Phone Stand Yes
Low Phone Stand Yes
Wall Mount Spacers (2) Yes
CONNECTING YOUR PHONE
The connectors of the GXP2124 are located on the bottom of the device
Table 2: GXP2124 Connectors
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 RJ22
Handset Jack RJ11
NOTE: 1. Extension for GXP2124 does not support hot-swap. Once connected, user should reboot the
phone to ensure the set up will work correctly.
SAFETY COMPLIANCES
The GXP2124 phone complies with FCC/CE and various safety standards. The GXP2124 power adaptor is
compliant with the UL standard. Only use the universal power adaptor provided with the GXP2124 package.
The manufacturer’s warranty does not cover damages to the phone caused by unsupported power adaptors.

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WARRANTY
If you purchased your GXP2124 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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Product Overview
Table 3: GXP2124 Product Models
Model Picture Overview
GXP-2124
GXP2124 is an executive SIP phone. It
features:
y4 lines
y24 programmable hard keys
y8 XML programmable soft keys
Table 4: GXP2124 Comparison Guide
Features GXP-2124
LCD Display 240x120 pixel
Number of Lines 4
Programmable Hard Keys 24
Soft Keys 8
Extension Module No
Table 5: GXP2124 Key Features in a Glance
Features Benefits
Open Standards Compatible SIP 2.0, TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, ARP/RARP, ICMP,
DNS (A record and SRV), DHCP (both client and server), PPPoE,
TFTP, NTP, Telnet, and TLS.
Superb Audio Quality Advanced Digital Signal Processing (DSP), Silence suppression,
VAD, CNG, AGC.
Network Interfaces Dual 10/100mbps Ethernet ports, headset jack (RJ22 and/or 2.5mm
jack).
Feature Rich Traditional voice features including caller ID, call waiting, hold,
transfer, forward, block, autodial, off-hook dial, and click to dial.
Advanced Features Multi-line support with dual-color LED, multi-party conferencing, line
extension interface, large back-litgraphic LCD, 5 or 3 navigation keys,
dedicated buttons for hold, send, speakerphone, headset, transfer,
conference (for up to 5 parties depending on model), mute, message,
Do-not-disturb, phone book, intercom/paging.
Advanced Functionality Custom down-loadable ring-tones, SRTP, SIP over TLS, multi-
language support and XML enabled, adjustable positioning angles,
wall mountable, AES encryption.

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Table 6: GXP2124 Hardware Specifications
LAN Interface (Ethernet ports) Two (2) 10/100 Mbps Full/Half Duplex Ethernet Switch with LAN and PC port
with auto detection
Graphic LCD Display
GXP-2124
240x120
pixel
Expansion Module Support
GXP-2124
N0
Headset Jack
GXP-2124
EHS and
RJ22
Call Appearance LED
Dual color (green/red)
GXP-2124
32
Power over Ethernet Built-in auto-sensing: Cisco and IEEE 802.3af standard: phone
draws power from both spare lines or signal lines from Ethernet
Universal Switching Input: 100-240VAC 50-60 Hz
Power Adaptor Output: +5VDC, 800mA, UL certified
Dimension
GXP-2124 251mm(l) x 202mm(w) x 77mm(h)
Weight
GXP-2124
0.86kg
(3.64lbs)
Temperature 32 –104° F/ 0 – 40°C
Humidity 10% – 90% (non-condensing)
Compliance FCC / CE / C-Tick
Table 7: GXP2124 Technical Specifications
Lines Multiple direct lines with independent SIP accounts, programmable speed dial keys,
XML programmable soft-keys.

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Protocol
Support Support SIP 2.0, TCP/UDP/IP, PPPoE, RTP/RTCP, SRTP by SDES, HTTP,
ARP/RARP, ICMP, DNS, DHCP, NTP, TFTP, SIMPLE/PRESENCE protocols
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 7 MFKs, SIP Dialog package (RFC 4235)
Support for SIP MESSAGE method (RFC 3428)
Stores up to 100 incoming IM messages (drops IM message 101 plus)
Display Back-lit graphic LCD display.
Feature Keys
GXP-2124
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
Device
Management
NAT-friendly remote software upgrade (via TFTP/HTTP) for deployed devices
including behind firewall/NAT
Auto/manual provisioning system, GUI Interface
Support Layer 2 (802.1Q, VLAN, 802.1p) and Layer 3 QoS (ToS, DiffServ, MPLS)
Expansion interface, Address Book
Audio Features 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), GSM 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
Adaptive jitter buffer control (patent-pending) and packet delay & loss concealment
Telephony
Features 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 4), dial plan prefix, off-hook auto dial, auto answer,
early dial and speed dial (on some models)
Network and
Provisioning Via keypad/LCD, Web browser, or secure (AES encrypted) central configuration file,
manual or dynamic host configuration protocol (DHCP) network setup

Grandstream Networks, Inc. GXP2124 User Manual_1.0.0.01 Page 10 of 38
Support NAT traversal using IETF STUN and Symmetric RTP
Support for IEEE 802.1p/Q tagging (VLAN), Layer 3 TOS
Firmware
Upgrades Support firmware upgrade via TFTP or HTTP,
Support for Authenticating configuration file before accepting changes
User specific URL for configuration file and firmware files
Advanced
Server Features Message waiting indication, support DNS SRV Look up and SIP Server Fail Over, Support customizable idle screen via downloading XML by HTTP/TFTP
Security DIGEST authentication and encryption using MD5 and MD5-sess, SRTP, SIP over
TLS

Grandstream Networks, Inc. GXP2124 User Manual_1.0.0.01 Page 11 of 38
Using the GXP2124 SIP Enterprise Phone
GETTING FAMILIAR WITH THE LCD
GXP-2124 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.
SIP PHONE LINES Displays the available phone lines. Choose a phone line by pressing the
corresponding line selector on the left-hand side.
DATE AND TIME Displays the current date and time. Can be synchronized with Internet time servers.
LOGO Displays company logo. This logo can be customized. For more information on
customizing the logo, please check page 24.
NETWORK STATUS Shows the status of the phone and network. It will indicate whether the network is
down, starting or is running (show IP-number). Other messages such as “DO NOT
DISTURB” or “## MISSED CALLS” are 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 SELECTOR BUTTONS
SOFT-BUTTONS
(Excluding GXP-2000)
The soft-buttons are context sensitive and will change depending on the status of
the phone. Typical functions assigned to soft-buttons are:
•NEW CALL Press this button to make a new hand-free call.
•FORWARD ALL Unconditionally forwards the main phone line to another
phone
•MISSED CALLS This option shows up there were unanswered calls to this
phone. The MissedCalls option shows a list of the missed
calls
•CALL RETURN Calls the phone that called/tried to call your phone last.
•REDIAL Redials the last number
•END CALL Hangs up phone
Table 9: LCD Icons
Icon LCD Icon Definitions
Connectivity Status / SIP Proxy/Server Icon:
Solid – connected to SIP Server/IP address received
Blinking – physical connection failed
Blank – SIP Proxy/Server not registered
Phone Status Icon:
OFF when the handset is on-hook
ON when the handset is off-hook

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Speaker Phone Status Icon:
FLASH when phone rings or a call is pending
OFF when the speakerphone is off
ON when the speakerphone is on
DND Icon:
ON when the “do not disturb” is activated
Activate by pressing MUTE/DEL button once
Calls Forwarded Icon:
INDICATES calls are forwarded
Follow ‘call forwarding’ procedures
Handset, Speakerphone and Ring Volume Icon:
Each icon appears next to the volume icon
To adjust volume, use the up/down button
Real–time Clock:
Synchronized to Internet time server
Time zone configurable via web browser
AM/PM indicator
PM
AM

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TABLE 10: GXP2124 KEYPAD BUTTONS
Key Button Key Button Definitions
LINE BUTTONS Line keys with LED, can be configured to different SIP profiles
TRANSFER TRANSFER key: Transfer an ACTIVE call to another number
CONF Press CONF button to connect Calling/Called party into conference
MUTE Mute an active call; or Delete a key entry
Also used to ‘REJECT’ incoming call.
HOLD Place ACTIVE call on hold
MSG Enter to retrieve voice mails or other messages
Enable/Disable hands-free speaker mode
SEND Press SEND to dial a new number or redial the last number dialed. Press
send button to send a call immediately before “no key entry timeout” value
expires
Enter to retrieve voice mails or other messages
MENU Enter Keypad Configuration “MENU” mode when phone is in IDLE mode.
Use as ENTER key when in Keypad Configuration.
0 - 9, *, # Standard phone keypad; press # key to send call; press * key to for IVR
functions
DND DO NOT DISTURB key; Press DND to turn “Do not disturb” function on or off.
HEADSET Toggle between headset and speakerphone mode when in hands free mode
INTERCOM Turn intercom function on/off
Brings phonebook on screen

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MAKING PHONE CALLS
Handset, Speakerphone and Headset Mode
Handset can be toggled between Speaker and Headset. To switch between Handset and Speaker/Headset,
press the Hook Flash in the handset cradle or press the SPEAKER button.
Multiple SIP Accounts and Lines
GXP2124 can support up to 4 independent SIP accounts depending on the product model. 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.
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 GXP2124 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 4 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.
•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.

Grandstream Networks, Inc. GXP2124 User Manual_1.0.0.01 Page 15 of 38
3. CALL RETURN:To call the last phone number that called your phone.
When returning a call, the phone will use the same SIP account as the call was made to. Thus, when
returning a call made to the third SIP account, the phone will use the third SIP account return the call.
i. Hand-free option
1. Press the CALL RETURN soft-key
ii. Hand-set option
1. Take the Handset off-hook
2. Press the CALL RETURN soft-key
4. USING THE CALL HISTORY:To call a phone number in the phone’s 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 “Received Calls”, “Missed Calls” or “Dialed Calls” depending on
your needs
•Select phone number using the arrow keys
•Press OK to select
•Press OK again to dial.
5. USING THE PHONEBOOK:Calling a phone in from the phone’s 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” and
Press MENU
•Select the phone number by using the arrow keys
•Press OK so select
•Press OK again to dial.
6. 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 USING.
•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.

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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 calling 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).
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 GXP2124 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 IP-
IP call will also use STUN. Configure the “Use Random Port” to “NO” when completing Direct IP calls.

Grandstream Networks, Inc. GXP2124 User Manual_1.0.0.01 Page 17 of 38
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
1. Press the “DND” button if you do not want to take a call. This will send the caller directly to voicemail.
2. Press the “DND” button to set phone to ‘do not disturb’ (icon will be on the screen). The phone will
not ring and send caller directly to voicemail. (see note above)
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/Delete
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
GXP2124 supports both Blind and Attended (or supervised) transfer:
1. Blind Transfer: Press “TRANSFER” button, then dial the number and press the “SEND” button to
complete transfer of active call.
2. Attended (or Supervised) Transfer: Press “LINEx” button to make a call and automatically place
the ACTIVE LINE on HOLD. Once the call is established, press “TRANSFER (or TRNF)” 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.

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Voice Messages (Message Waiting Indicator)
A blinking red MWI (Message Waiting Indicator) indicates a message is waiting. Press the MSG 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.
CALL FEATURES
The GXP2124 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: GXP2124 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)
*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

Grandstream Networks, Inc. GXP2124 User Manual_1.0.0.01 Page 19 of 38
Dial “*93” for a dial tone, then hang up.
CUSTOMIZED LCD SCREEN &XML
Grandstream GXP2124 phones 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 GXP2124,
please visit our website at: http://www.grandstream.com/support/gxp_series/general/gxp_support.html .
Configuration Guide
The GXP2124 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, delete an entry by pressing the MUTE/DEL button. 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 8.
Table 12: Key Pad Configuration Menu
Call History Displays histories of incoming, dialed and missed calls.
Status
Displays the network status, account statuses, software version and
MAC-address of the phone.
Phone Book Displays the phonebook
LDAP Directory Displays the LDAP directory
Instant Messages Goes to voice messages
Direct IP call Displays the IP-call options menu
Preference Press Menu button to enter this sub menu including
•“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

Grandstream Networks, Inc. GXP2124 User Manual_1.0.0.01 Page 20 of 38
•LCD Brightness
•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 Grandstream logo.
•Display Language
You can choose English, Chinese or Secondary Language
Press Menu button to choose the menu item.
Press ‘←’ to return to the main menu.