Avaya 555-245-600 manual Multi-home single Communication Manager system

Call processing

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.

142 Avaya Application Solutions IP Telephony Deployment Guide