Network Diagram
Interrogating CSCF (Call State Control Function)
Interrogating-Call State Control Function is first contact point within an operator or service provider network for inbound calls from outside the network. I-CSCF is used for selecting appropriate S-CSCF function that will serve the user. It manages the registration, session related and session-unrelated message flows and charging data generation.
Features
- SCSCF Assignment
- HSS Client
- Offline Client
- Trusted Domain Verification
Network Diagram 
Serving CSCF (Call State Control Function) The Serving-CSCF (S-CSCF) performs the session control services for the UE. It maintains a session state as needed by the network operator for support of the services. In an operator network there may be different S-CSCFs with different functionalities. S-CSCF is core switch or brain of an IMS network, with Registration, Session Management, Routing logic and Charging and resource utilization functions embedded into it.
Features
- E.164 DNS Translation
- HSS Client
- Registrar and Authentication
- Online Client
- Offline Client
- Event Subscription and Notification
- Routing
- Initial Filter Criteria Processing and Caching
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