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The Proxy For Call Session Control Function (P-CSCF) is the first contact point within  the IP Multimedia (IM) Core Network (CN) subsystem for subscribers in an IP Multimedia Subsystem (IMS) network. The SBC

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may be deployed with many functions of a P-CSCF in an IMS network. A P-CSCF is allocated to the IMS terminal during IMS registration, and does not change for the duration of the registration. From a standards perspective, the P-CSCF behaves like a SIP Proxy. In other words, it accepts requests and services them internally or forwards them onwards. The figure below depicts the

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in the role of a P-CSCF.

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• S-CSCF / I-CSCF over Mw interface (SIP)
• I-CSCF over Mw interface (SIP)
• IBCF over Mx interface (SIP)
• P-CSCF/A-SBC

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  to MGCF over Mb interface (RTP/RTCP)
• PCRF over Rx interface (Diameter)
• DNS interface from P-CSCF to DNS server
• GM interface between UE and P-CSCF

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