P-CSCF

The P-CSCF is the first point of contact between the IMS network and the user device. Acting as the SIP signaling entry point, it handles initial registration, ensures session initiation, enforces security policies, and interacts with QoS and policy control components. Positioned close to the user, it minimizes latency and enhances reliability and security.
P-CSCF
Feature List
 
Forwards and supports authentication of user registration requests
SIP signaling compression/decompression (SigComp)
Initial handling of session initiation and termination
Interfacing with PCRF for QoS control and policy enforcement
SIP signaling security via encryption (IPSec/TLS)
NAT traversal support (STUN/TURN/ICE)
Generation of initial session records (e.g., CDRs)
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