P-CSCF - Proxy Call Session Control Function

The Proxy Call Session Control Function is an IMS (IP Multimedia Subsystem) element that identified as the mobiles first contact point within the IM CN (IP Multimedia Core Network) subsystem. Functions of the P-CSCF include the forwarding of SIP messages received from the UE. These may be sent to the I-CSCF or S-CSCF, depending on the type of message and procedure being carried out. The P-CSCF is also responsible for the generation of CDR (Call Detail Record).