Tech-invite3GPPspaceIETFspace
SIP ↠  ExamplesGrammarsPresence ⇾  MainServicesTransactionDialogIMS
TS 24.228§6.7.2   List   Prev   Next
Up   Down   Prev   Next
IMS R6 Registration signalling flow - Network-initiated deregistration event occuring in the HSS - sequence chart for IMS R6-1. SIP NOTIFY request
  • This example assumes that UE1 and P-CSCF1 both have subscribed for the user's registration state event package and shows how UE1 and P-CSCF1 are notified when the network-initiated deregistration event occurs in the HSS.
  • HSS initiates the deregistration, sending a Cx-Deregister (subscriber identity).
  • After getting the Cx-Deregister message S-CSCF1 immediately sends a NOTIFY request towards UE1 order to inform about the network initiated deregistration and the subscription termination. The same Request URI, To, From, Call-ID are used as in the first NOTIFY request. CSeq is incremented since this is the second NOTIFY request sent towards UE1.