Session Manager uses routing to determine which SIP entity receives a call. Routing policies define how Session Manager routes calls between different SIP network elements. The system distributes configuration data from the Routing database to each remote Session Manager instance.

All calls originate either from a SIP entity or an administered user of the system.

Session Manager uses locations for origination-based routing and for specifying bandwidth for Call Admission Control.

Administrators define Session Manager routing:

• by combining several locations.

• by combining several dial patterns and domains.

• for several ToD and rankings.

• for a single routing destination.