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SIP ↠  ExamplesGrammarsPresence ⇾  MainServicesTransactionDialogIMS
TS 24.228§7.2.3§7.3.5§7.4.3   List   Prev   Next
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IMS S2 signalling flow - Session Initiation: mobile origination and termination in home network - IMS S2-3e. SIP PRACK request (UE1 to UE2): from P-CSCF2 to UE2
  • Via: P-CSCF1 adds the port number negotiated during the security agreement and the comp=sigcomp parameter to its own entry in the Via header.