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IMS R6 Registration signalling flow - Network-initiated deregistration event occuring in the HSS - sequence chart for IMS R6-3. SIP NOTIFY request
  • S-CSCF1 also sends a NOTIFY request towards P-CSCF1 to which UE1 is attached to, in order to inform about the network initiated deregistration. 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 P-CSCF1.