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SIP ↠  ExamplesGrammarsPresence ⇾  MainServicesTransactionDialogIMS
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 S1-8e. SIP PRACK request (UE1 to UE2): from P-CSCF2 to UE2
  • Via: P-CSCF2 adds the port number negotiated during the security agreement and the comp=sigcomp parameter to its own entry in the Via header.