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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 S4-1c. SIP INVITE request (UE1 to UE2): from S-CSCF1 to BGCF1