P-CSCFProxy Call Session Control Function
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We have recommended that, after layer 3 handover and discovery of new P-CSCF, UE should transmit a new subsequent request for handover to S-CSCF for replacing old IP address of UE with new one.
designed a virtualized IMS testbed which contains virtualized P-CSCF, S-CSCF, HSS and UE (User Equipment) based on VMWare [7].
UE enters into its IMS network through P-CSCF. It continues to S-CSCF.
* Simulates P-CSCF, I-CSCF, S-CSCF, PCRF, HSS, BGCF, MGCF elements in LTE IMS network supporting Cx/Dx, Rx, Gx, Gm, Mw, SGi, Mi, and Mj interfaces
The main entry point for UE to connect to IMS is P-CSCF. By the consideration of SIP sginlling, P-CSCF is a node to route and process SIP message for UE.
The first user's contact point into the IMS is Proxy Call Session Control Function (P-CSCF).
P-CSCF is the first point of contact for the IMS terminal.
At the subscriber access border, the SD integrates the Proxy-Call Session Control Function (P-CSCF), the initial SIP signalling contact point for subscriber endpoints and the Access Gateway Function (AGW) for controlling subscriber media flows.