SIP ↠  ExamplesGrammarsPresence ⇾  MainServicesTransactionDialogIMS
TS 24.228§7.2.4§7.3.5§7.4.3   List   Prev   Next
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IMS S3 signalling flow - Session Initiation: Origination in CS Network, and Mobile termination in home network - IMS S3-1b. SIP INVITE request (UE1 to UE2): from I-CSCF1 to S-CSCF2
  • The I-CSCF does not add itself to the Record-Route header, as it has no need to remain in the signalling path once the session is established.