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IMS S2 signalling flow - Session Initiation: mobile origination and termination in home network - IMS S2-10a. SIP 200 OK response (INVITE): from UE2 to P-CSCF2
  • When the called party answers, UE2 sends a 200 OK final response to the INVITE request to P-CSCF2, and starts the media flow(s) for this session.
  • P-CSCF2 approves the commitment of the QoS resources if it was not approved yet.