User Guide
Grandstream Networks, Inc.  GXP User Manual  Page 12 of 44 
       Firmware 1.2.5.3     Last Updated: 03/2011 
(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, 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 
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 










