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A P-CSCF has multiple roles in the network as defined by IMS/MMD standard. ... rules function [0030] P-CSCF: Proxy Call Session Control Function [0031] PDG:

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Posted by waqasahmad

The P-CSCF is the first contact to the home or visited IMS for a subscriber on the UE. It
controls session setup between the core network and the IMS. The P-CSCF function also
establishes security with the UE and locates the correct Serving-CSCF for the subscriber

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Posted by Zufen