H.323 Protocol - Polycom IP 320 Administrator's Manual

H.323 Protocol

Note
This feature requires a license key for activation on the Polycom VVX 1500. Using
this feature may require purchase of a license key or activation by Polycom
channels. For more information, contact your Certified Polycom Reseller.
As of SIP 3.2.2, telephony signaling support via the H.323 family of protocols
enabling direct communication with H.323 endpoints, gatekeepers, call and
media servers, and signaling gateways is supported on the Polycom VVX 1500
phone.
SIP and H.323 signaling can be supported at the same time, including bridging
both types of calls during multi-party conference calls. Automatic detection of
the correct or optimal signaling protocol is available when dialing from the
contact or corporate directories. While SIP supports server redundancy and
several transport options, only a single configured H.323 gatekeeper address
per phone is supported. H.323 gatekeepers are optional, but if available, they
must be used. If a gatekeeper is not configured or unavailable, calls can still be
made if so configured.
If the H.323 protocol is disabled, there will be no visible evidence in the user
interface of the Polycom VVX 1500 phone.
Support of the SIP protocol for telephony signaling can be disabled on the
Polycom VVX 1500 such that all calls would be routed via the H.323 protocol.
This section provides detailed information on:
• Supported Standards
• Supported Polycom Interoperability
• Configuration File Changes
• Useful Tips
• Examples
Supported Standards
The following standards are supported by the implementation of this feature:
Standard
ITU-T Recommendation H.323 (2003)
ITU-T Recommendation Q.931 (1998)
ITU-T Recommendation H.225.0 (2003)
Configuring Your System
Description
Packet-based multimedia
communications systems
ISDN user-network interface layer 3
specification for basic call control
Call signaling protocols and media
stream packetization for packet based
multimedia communications systems
4 - 87