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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 S3-10b. SIP 200 OK response (INVITE): from P-CSCF2 to S-CSCF2