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P-CSCF - Proxy – Call Session Control Function

The P-CSCF acts as the ingress and egress point to and from a service provider’s IMS domain with respect to the IMS client. The P-CSCF has a large number of responsibilities, including: onward routing of registration and session requests to the correct nodes in the network, ensuring the S-CSCF (Serving CSCF) is kept updated on the access network the subscriber is using, providing session information to the PCRF (Policy and Charging Rules Function) and maintaining a secure connection with the client device.


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

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