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Call processing
142 Avaya Application Solutions IP Telephony Deployment Guide
Figure 51: Message flow for multi-home multi-Communication Manager configuration
Multi-home single Communication Manager system
One possible configuration is to only have a single Communication Manager system in the SIP
deployment. The reason for doing this is to support features where SIP/AST users must located
on the same Communication Manager system for certain features. One of these scenarios is
the bridging feature in Advanced SIP Telephony (AST). For Communication Manager to
properly handle the bridging notifications and feature interactions, the bridged users must be on
the same Communication Manager system.
This configuration has a particular optimization: instead of routing a call through the edge for
home-to-home calls for two SIP/AST users, Communication Manager will send the call to the
far-end home after the origination processing is complete. For example, say Al is located on the
Lincroft SES, and Duffy is located on the Denver SES. When Al calls Duffy, AST does
originating processing for Al and realizes that Al is calling another OPTIM user on the same
system, and then sends it to the home for that user (see Figure 53:
Multi-home single
Communication Manager configuration - message flow on page 143). This means in this
configuration, the edge would be used purely for out-of-domain calling.