Key Components:

  * P-CSCF: Proxy that routes SIP messages between devices and IMS.
  * S-CSCF: Manages SIP sessions and interacts with HSS (subscriber database).
  * MGCF: Connects to circuit-switched networks (e.g., PSTN).

Free5GC Introduction of IP Multimedia Subsystem Part 1: [[https://free5gc.org/blog/20231108/20231108/|https://free5gc.org/blog/20231108/20231108/]]

Free 5GC Introduction of IP Multimedia Subsystem Part 2: [[https://free5gc.org/blog/20231206/20231206/#registration-flow|https://free5gc.org/blog/20231206/20231206/#registration-flow]]

Free 5GC Introduction of IP Multimedia Subsystem Part 2: [[https://free5gc.org/blog/20240327/20240327/|https://free5gc.org/blog/20240327/20240327/]]