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IMS S2 signalling flow - Session Initiation: mobile origination and termination in home network - IMS S2-2e. SIP 183 Session Progress response: from S-CSCF1 to P-CSCF1
  • P-CSCF1 authorizes the resources necessary for this session. The approval of QoS commitment either happens at this stage or after 200 OK of INVITE based on operator local policy.