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SIP ↠  ExamplesGrammarsPresence ⇾  MainServicesTransactionDialogIMS
TS 24.228§7.2.3§7.3.6§7.4.4   List   Prev   Next
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IMS S4 signalling flow - Session Initiation: Mobile origination in home network, Termination in CS network - IMS S4-3a. SIP PRACK request (UE1 to UE2): from UE1 to P-CSCF1
  • The request does not contain SDP because in the initial SDP offer/answer there was a single media stream with a single codec.