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Avaya Aura® Communication Manager Feature Description and Implementation
Precedence calls to destinations over ISDN-PRI trunks scenario
In the figure, the destination server, MLPP Server 2, uses the service domains and precedence levels to treat calls as follows:
User C makes a routine call to user B and is still connected. The server checks the service domain of the COR of user C, and assigns service domain 2 to the call.
User A, who is on MLPP Server 1, makes a precedence call to user B. Server 2 checks the service domain on the incoming ISDN call and finds service domain 2, which is defined in the COR of user A on Server 1. Server 2 assigns service domain 2 to the call.
The server matches the service domain of user C with the service domain of user A.
Because the calls are in the same service domain, and because user A used a higher precedence level than user C, the server allows user A to preempt user C.