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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 
on page 143). This means in this 
configuration, the edge would be used purely for out-of-domain calling.