Grandstream Networks GXP21XX User manual

Grandstream Networks, Inc.
GXP21xx SIP Enterprise Phones

Grandstream Networks, Inc. GXP21xx User Manual Page 1 of 48
Firmware version: 1.0.1.110 Last Updated: 01/2012
TABLE OF CONTENTS
GXP21XX USER MANUAL
WELCOME .................................................................................................................................................................3
INSTALLATION.........................................................................................................................................................4
EQUIPMENT PACKAGING.............................................................................................................................................4
CONNECTING YOUR PHONE ........................................................................................................................................4
GXP2120/2110 EXTENSION UNIT...............................................................................................................................4
SAFETY COMPLIANCES................................................................................................................................................5
WARRANTY.................................................................................................................................................................6
PRODUCT OVERVIEW............................................................................................................................................7
USING THE GXP21XX SIP ENTERPRISE PHONE ...........................................................................................11
GETTING FAMILIAR WITH THE LCD..........................................................................................................................11
MAKING PHONE CALLS.............................................................................................................................................14
ANSWERING PHONE CALLS.......................................................................................................................................17
PHONE FUNCTIONS DURING A PHONE CALL .............................................................................................................18
CALL FEATURES........................................................................................................................................................21
CUSTOMIZED LCD SCREEN &XML.........................................................................................................................22
CONFIGURATION GUIDE ......................................................................................................................................22
CONFIGURATION VIA KEYPAD..................................................................................................................................23
CONFIGURATION VIA WEB BROWSER ......................................................................................................................26
SAVING THE CONFIGURATION CHANGES...................................................................................................................45
REBOOTING THE PHONE REMOTELY .........................................................................................................................45
SOFTWARE UPGRADE & CUSTOMIZATION..................................................................................................46
FIRMWARE UPGRADE THROUGH TFTP/HTTP..........................................................................................................46
CONFIGURATION FILE DOWNLOAD ...........................................................................................................................47
RESTORE FACTORY DEFAULT SETTING.......................................................................................................48
TABLE OF FIGURES
GXP21XX USER MANUAL
Figure 1: Connecting the GXP2120/2110 and the GXP Extension Board...................................... 5
Figure 2: Keypad GUI Flow........................................................................................................... 24
TABLE OF TABLES
GXP21XX USER MANUAL
Table 1: Equipment Packaging ....................................................................................................... 4
Table 2: GXP21xx Connectors ....................................................................................................... 4
Table 3: GXP21xx Product Models................................................................................................. 7
Table 4: GXP21xx Comparison Guide............................................................................................ 7
Table 5: GXP21xx Key Features in a Glance ................................................................................. 8

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Table 6: GXP21xx Hardware Specifications ................................................................................... 8
Table 7: GXP21xx Technical Specifications ................................................................................... 9
Table 8: LCD Display Definition .................................................................................................... 11
Table 9: LCD Icons ....................................................................................................................... 12
Table 10: GXP21xx Keypad Buttons ............................................................................................ 13
Table 11: GXP21xx Call Features ................................................................................................ 21
Table 12: Key Pad Configuration Menu ........................................................................................ 23
Table 13: Device Configuration - Status ....................................................................................... 27
Table 14: Device Configuration – Settings/Basic Settings............................................................ 27
Table 15: Device Configuration – Settings /Advanced Settings ................................................... 31
Table 16: SIP Account Settings .................................................................................................... 37
GUI INTERFACE EXAMPLES
GXP21XX USER MANUAL
http://www.grandstream.com/products/gxp_series/general/documents/gxp21xx_gui.zip
1. Screenshot of Configuration Login Page
2. Screenshot of Status Page
3. Screenshot of Basic Setting Configuration Page
4. Screenshot of Advanced User Configuration Page
5. Screenshot of SIP Account Configuration Page
6. Screenshot of Saved Configuration Changes Page
7. Screenshot of Reboot Page

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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.

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Firmware version: 1.0.1.110 Last Updated: 01/2012
Installation
EQUIPMENT PACKAGING
Table 1: Equipment Packaging
GXP2120 GXP2110 GXP2100
Main Case Yes Yes Yes
Handset Yes Yes Yes
Phone Cord Yes Yes Yes
Power Adaptor Yes Yes Yes
Ethernet Cable Yes Yes Yes
High Phone Stand Yes Yes Yes
Low Phone Stand Yes Yes No
Wall Mount Spacers (2) Yes Yes 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

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Figure 1: Connecting the GXP2120/2110 and the GXP Extension
GXP2120 with GXP Extension GXP Extension
Reverse side of connection with 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.
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.
Extension for GXP2120/2110 does not support hot-swap. Once connected, user should reboot the
phone to ensure the set up will work correctly.
GXP2120/2110 can drive 2 extension modules. Independent power adapters are not needed for
extension modules.
S AFETY C OMPLIANCES
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.

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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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Product Overview
Table 3: GXP21xx Product Models
Model Picture Overview
GXP2120
GXP2120 is an executive SIP phone. It features:
Six lines
Seven programmable hard keys
Four XML programmable soft keys
GXP2110
GXP2110 is an executive SIP phone. It features:
Four lines
Eighteen programmable hard keys
Three XML programmable soft keys
GXP2100
GXP2100 is an executive SIP phone. It features:
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 64 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, HTTP/HTTPS, ARP/RARP, ICMP,
DNS (A record, SRV and NAPTR), DHCP (both client and server),
PPPoE, TELNET, TFTP, NTP, STUN, SIMPLE, 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 answer, 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, Do-
Not-Disturb, phone book, intercom
Advanced Functionality Customized downloadable ring-tones, SRTP, SIP over TLS, multi-
language support and XML enabled, adjustable positioning angles, wall
mountable, AES encryption, automatic multimedia service (eg., weather,
stock and currency information)
Table 6: GXP21xx Hardware Specifications
Model GXP2120 GXP2110 GXP2100
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 320x160 pixel 240x120 pixel 180x90 pixel
Expansion
Module Support Yes No
Headset Jack 2.5mm and RJ9
Call Appearance
LED 13 Dual color (green/red)
22 Dual color (green/red) 11 Dual color (green/red)
Power over
Ethernet Built-in auto-sensing: Cisco and IEEE 802.3af standard
Universal
Switching Input: 100-240VAC 50-60
Hz
Input: 100-240VAC 50-60
Hz
Input: 100-240VAC 50-60
Hz
Power Adaptor Output: +5VDC, 800mA,
UL certified
Output: +5VDC, 800mA,
UL certified
Output: +5VDC, 800mA,
UL certified
Dimension 251mm(W) x 202mm(L) x
77mm(H)
252mm (W) x 210mm (L) x
78mm (H)
222mm (W) x 210mm (L)
x 93mm (H)
Weight 1.66KG (3.64lbs) 1.78KG (3.92lbs) 1.63KG (3.59lbs)
Temperature 32 –104° F/ 0 – 40°C

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Humidity 10% – 90% (non-condensing)
Compliance FCC / CE / C-Tick
Table 7: GXP21xx Technical Specifications
Lines Multiple direct lines with independent SIP accounts, programmable speed dial
keys, XML programmable soft-keys
Protocol Support Support SIP RFC3261, TCP/IP/UDP, RTP, HTTP/HTTPS, ARP/RARP, ICMP,
DNS (A record, SRV and NAPTR), DHCP (both client and server), PPPoE,
TELNET, TFTP, NTP, STUN, SIMPLE, 802.1x, TR-069
Support multiple SIP accounts
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)
Display Backlit graphic LCD display, up to 8 level grayscale
Feature Keys
Feature keys on different models:
GXP2120 GXP2110 GXP2100
HOLD Yes Yes Yes
SPEAKERPHONE Yes Yes Yes
SEND Yes Yes Yes
TRANSFER Yes Yes Yes
CONF Yes Yes Yes
MUTE Yes Yes Yes
DND Yes Yes No
HEADSET Yes Yes Yes
INTERCOM Yes Yes Yes
PHONEBOOK Yes Yes Yes
MSG Yes Yes Yes
MENU Yes Yes Yes
NAVIGATION (4) Yes Yes Yes
Device Management 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
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), 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

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concealment
HD audio handset with HD wideband audio codecs for excellent double-talk
performance
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 5), dial plan prefix, dial-plan support, off-hook
auto dial, auto answer, early dial and speed dial
Network and
Provisioning 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)
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
Mass provisioning using TR-069 or encrypted XML configuration file
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 User and administrator level passwords, MD5 and MD5-sess based
authentication, AES based secure configuration file, SRTP, TLS, 802.1x
media access control

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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 Display Definition
Item Definitions
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 ICON 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 forward the phone line to another phone.
MISSED CALL
This option shows up unanswered calls to this phone.
SWITCHSCR
Press this button to toggle between different idle screens.
REDIAL
Redial the last dialed number.
END CALL
Hang up phone.
REFRESHSTOCK
Refresh the stock information when stock is enabled.
REVERSECUR
Display the currency information in reverse order.
REFRESHCUR
Refresh the currency information when currency is enabled.

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SPECIAL SOFTKEYS
(Only When Integrated
with GXE5024/5028)
Call Parking:
FOR GXP2120/2110 ONLY. Please refer to GXE5024/5028 Online User
Manual for more information.
CallPark
When a GXP2120/2110 dials out, the Call Park softkey will display on
screen. To park the call, press the “Call Park” button.
PickUp
When another GXP2120/2110 goes off-hook, the Call Pickup softkey
will display on screen. To pick up the parked call, press the “Call
Pickup” button.
Call Queue:
FOR GXP2120/2110 ONLY. Please refer to 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 (idle): ON when “Do Not Disturb” is activated in idle screen
DND (talking): ON when “Do Not Disturb” is activated in talking
Forward All: INDICATES all incoming calls will be forwarded to the
configured number
Forward on Busy: INDICATES calls will be forwarded when phone is
busy
Forward on No Answer: INDICATES calls will be forwarded if the
phone does not answer
Forward All and No Answer: INDICATES calls will be forwarded if
Forward All and Forward on No Answer are enabled
Keypad Locked: ON when the keypad is locked

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Enter Keypad Unlock Password
Voice Mail: ON when there are new voice messages
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
Waiting For Response: Please wait for the phone system to response
before the keypad entry.
Handset Mode
Speaker Mode
Headset Mode
SRTP: SRTP is used during the call
MUTE
Table 10: GXP21xx Keypad Buttons
Key Button Key Button Definitions
LINE KEYS 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 Transfer an ACTIVE call to another number
CONF Press CONF button to connect Calling/Called party into conference
MUTE Mute an active call
HEADSET Press HEADSET key to answer/hang up phone calls while using
headset. It also allows user to toggle between headset and speaker
DND Enable/Disable DND (Not applicable on GXP2100)
INTERCOM Press to use intercom if intercom user ID is configured in web GUI
MENU/OK 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

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Brings phonebook on screen
Enable/Disable hands-free speaker
Enable/Disable handset mode ; or used as SEND/REDIAL
Navigation keys “Up” “Down” “Left” and “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, *, # Standard phone keypad; press # key to send call; press * key to for
IVR functions
Multi Purpose Keys 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.
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 GXP21xx will flash the next available LINE (from left to right or from top

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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 six 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.
When the phone is onhook, 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.
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.

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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.
6. VIA CALL RETURN:On the GXP21xx, the Multiple Purpose Key (programmable hard key) has to be
configured as Call Return under Web GUI->Basic Settings configuration. No user name and user ID
has to be set on the Multiple Purpose Key for Call Return. After pressing the Call Return key, the last
answered number will be dialed out.
Take handset off hook
Press the configured Call Return 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.
If “Speed Dial Via Active Account” is selected instead of “Speed Dial” on that Multi Purpose Key, it will act
just like speed dial but based on the current active account. For instance, if the phone is offhook and account
4 is active, by pressing this key it will call the configured speed dial number using account 4.
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

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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 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 -- offhook the phone, dial #3 followed by SEND or #
192.168.0.2 calling 192.168.0.23 -- offhook the phone, dial #23 followed by SEND or #
192.168.0.2 calling 192.168.0.123 -- offhook the phone, dial #123 followed 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.
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)

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Do Not Disturb
Press the “DND” button to enable/disable “Do Not Disturb” or set DND in MENU->Preference (for GXP2100),
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.
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. Also, users could make auto-attended transfer when
this feature is enabled from web GUI.
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.
3. Auto-Attended Transfer: Users could enable Auto-Attended Transfer under Web GUI->Advanced
Setting Page. During the first call, press “TRANSFER” hard button and it will bring up another line.
The first call will be on hold. Enter the number and press SEND key to establish the second call (If
pressing soft key “transfer” after entering the number, it will do blind transfer instead). After the
second call is established, press “TRANSFER” hard button again. Now the phone will hang up and
the call will be transferred.
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).

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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:
If after pressing the “CONF” button, a user decides not to conference anyone, press the
current active LINE button
This will resume two-way conversation with the current line
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.
GXP21xx also supports Easy Conference mode. In Easy Conference mode, users can initiate conference
by calling another number when the current line is in talking or conference. Also the conference can be re-
established by pressing the ReConf softkey when the conference is on hold. Easy Conference mode can be
used combined with the traditional ways to establish the 5-way conference above.
1. Initiate a Conference Call:
Establish one call
Press CONF button and a new line will be brought up
Dial the number and press SEND button to establish the second call
Press CONF button again or press the ConfCall softkey to establish the 3-way conference
2. Join More Parties in Existed Conference:
Establish conference call
Press CONF button and a new line will be brought up
Dial the number and press SEND button to establish the new call
Press CONF button again or press the ConfCall softkey to join the new party in the existed
conference
3. Hold Conference:
During the conference, press HOLD button and the conference will be put on hold
- To resume the conference, press the ReConf softkey
- To split the conference and resume the call with each party, press the corresponding
line key
4. End Conference:
If the users decide not to conference after establishing the second call, press EndCall
softkey instead of ConfCall softkey/CONF button. It will end the second call and the screen
will show the first call/conference is on hold.
During the conference, press EndCall softkey or hang up to end the conference
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.