SIP ↠  ExamplesGrammarsPresence ⇾  MainServicesTransactionDialogIMS
TS 24.228§7.2.4§7.3.5§7.4.3   List   Prev   Next
Top   Up   None   Next
IMS S3 signalling flow - Session Initiation: Origination in CS Network, and Mobile termination in home network - IMS S3-2a. SIP 183 Session Progress response: from UE2 to P-CSCF2
  • P-Access-Network-Info: the UE provides the access-type and access-info, related to the serving access network.
  • To: a tag is added to the To header.
  • Contact: contains a SIP URI with the IP address or FQDN of the UE; it includes the comp=sigcomp parameter.
  • SDP: the SDP contains the set of codecs supported by UE; it requests a confirmation of the QoS preconditions for establishing the session.