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Ti+  for  TS 24.228§6.7.3
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IMS R7 Registration signalling flow - Network-initiated deregistration upon UE roaming and registration to a new network - sequence chart for IMS R7-3. SIP NOTIFY request
  • As there was a change in the user's registration status and the old P-CSCF is still subscribed to the registration event package for that user, therefore, S-CSCF1 sends a NOTIFY request to P-CSCF1.