S-CSCF in IMS Network

S-CSCF refers to "Serving Call Session Control Function". It is the central node in the IMS network.

The roles of the S-CSCF include,

  • Handles the Registration of the UEs to the IMS network, and stores registration information of the UEs.
  • Retrieves user profile information of each registered UE from the HSS/UDM.
  • Controls the multimedia sessions, including session establishment, modification, and termination.
  • Triggers various IMS services for the UEs according to their user profile information and according to configurations.