SBC supports the following call processing elements which determine the services, routing and policy data applicable for the call:
- Subscriber (Calling Party)
- Destination (Called Party)
- Carrier (based on Carrier Selection Priority associated with the Trunk Group)
- Trunk Group
SBC is configurable to interact with one or more centralized PSXs (up to nine external PSXs), the local Policy Server (ERE) or a combination of external PSXs and ERE.