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SIP ↠  ExamplesGrammarsPresence ⇾  MainServicesTransactionDialogIMS
TS 24.228§6.7.2   List   Prev   Next
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IMS R6 Registration signalling flow - Network-initiated deregistration event occuring in the HSS - IMS R6-2b. SIP 200 OK response: from P-CSCF1 to S-CSCF1