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IMS S3 signalling flow - Session Initiation: Origination in CS Network, and Mobile termination in home network - IMS S3-3a. SIP PRACK request (UE1 to UE2): from MGCF1 to S-CSCF2
  • MGCF sends a PRACK request without SDP, because there is not another set of codecs to the original SDP offer.
  • Via: Takes the value of either the IP address or FQDN of the originating MGCF.
  • CSeq: Takes a higher value than that in the previous request.