Table of Contents
Advertisement
Call Processing
All IP endpoints (IP Softphones, IP agents, and IP Telephones) H.323 voice applications should
register with an Avaya gatekeeper before any calls are attempted. Communication Manager
enforces call signaling (Q.931) and call control (H.245) channels from endpoints to terminate on
the gatekeeper. This allows Communication Manager to provide many of its calling features to
H.323 calls.
Registration and alternate gatekeeper list
The RAS protocol is used by the IP endpoint to discover and register with the Communication
Manager gatekeeper. The discovery mechanism uses unicast IP facilities.
When registration with the original gatekeeper (C-LAN or S8300) IP address is successful, the
switch sends back the IP addresses of all the C-LANs (or LSPs) in the IP Telephone's network
region. These addresses are used if the call signaling to the original C-LAN circuit pack fails.
Figure 37: Discovery and registration process to the gatekeeper
shows the registration
process.
Figure 37: Discovery and registration process to the gatekeeper
Issue 3.4.1 June 2005
93
Advertisement
Table of Contents
