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Refer to AE Services implementation for Microsoft Office Communications server - dial figure as you read through this high level description of setting up a dial plan.
In terms of its basic functionality, the AE Services implementation for Microsoft Office Live Communications Server or Microsoft Office Communications Server 2007 acts as a SIP to CSTA III gateway. In simplest terms, the interactions between Communicator, AE Services and Communication Manager are as follows:
Communicator passes phone numbers in TelURI format to AE Services.
Based on Dial Plan settings, AE Services converts them from TelURI format (+13035551234) to an extension (such as 5381234), and passes them to Communication Manager.
Communication Manager, in turn, passes the extension back to AE Services. Based on Dial Plan settings in the Application Enablement Services Management Console (AE Services Management Console) AE Services converts extensions to TelURI format and passes them back to Communicator.
Specific Avaya SIP endpoints can be controlled if your configuration relies on AE Services 4.1 or later, and Communication Manager 5.0. AE Services 4.1, or later, supports SIP enabled endpoints (Avaya 16CC and 9620, 9630, 9630G, 9640, and 9640G SIP endpoints with firmware version 2).