User Guide
Grandstream Networks, Inc.  GXP User Manual  Page 20 of 38 
  Firmware 1.1.5.15  Last Updated: 12/2007 
CALL FEATURES 
The GXP 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: GXP 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. 
C
USTOMIZED LCD SCREEN & XML 
With its graphical LCD screen, soft-keys and XML-support, the GXP is a highly customizable phone. XML is 
used to communicate between web-servers and the GXP to dynamically update the phone’s phonebook and 
idle screen logo and functions. 
XML Phonebook 
The Grandstream GXP enables you to easily share and maintain a phonebook through the web. The XML-
phonebook must be stored on a web-server. For more information on how to setup the phone to download the 
phonebook, please check section Configuration with Web Browser. For more information on how to create a 
downloadable XML phonebook, detailed information and configuration guides are located on the website in the 
GXP tab @ http://www.grandstream.com/resources.html
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