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TS 24.228 – §7.2.2 – §7.3.2 – §7.4.2   List   Prev   Next
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IMS S1 signalling flow - Session Initiation: Mobile origination and termination roaming, with different network operators - IMS S1-11a. SIP ACK request (UE1 to UE2): from UE1 to P-CSCF1
  • UE1 starts the media flow for this session, and responds to the 200 (OK) response with an ACK request sent to P-CSCF1.