H.323 Release 3.1 can be installed on 9610, 9620, 9620L, 9620C, 9630, 9630G, 9640, 9640G, 9650, 9650C, and 9670G IP deskphones. The release is compatible with Communication Manager releases 3.1.4 and later.

H.323 Release 3.1.5 adds:

• Support of Visiting User.
• Support for 802.1Q tagging over a VPN connection.
• Readability improvements to the top line on the 9620C/9640/9640G/9650C IP Deskphones.
• Differentiated Ringing or Internal/External calls with "Alternative" Ringing.

H.323 Release 3.1 includes the following new features:

• Web API updates:
  • Global variables provide access to deskphone properties (extension, MAC address, IP address and model) in all web and API HTTP requests (URLs).
  • Support for touch-sensitive image maps on 9760G deskphone displays.
  • Support for automatic submission of forms.
  • Ability to "go to phone" or "go to home" page via links from a web page.
• Improved endpoint re-registration after failover, implemented by reusing the previous or known good IP address of call servers and gateways.
• Robust processor Ethernet duplication support.
• Split registration (with Communication Manager 5.2 and higher only).
• Support for the Med extensions for Power Allocation over LLDP.
• The H.323 firmware release 3.0 and 9670G firmware release 2.0 code lines have been merged.
• Call log backup status messages have been removed from the top line of the deskphone display except when a manual backup has been undertaken or when a backup fails.
• The deskphone display is normalized when a user enters a deskphone application.
• All 9600 series deskphones can be used with Avaya IP Office Release 5.1 and above.
• A new user option allows users to select to "go to phone screen on answer".
• Miscellaneous user interface enhancements.

Note: The H.323 Release 3.1 Push API does not support the Phonexml push type.