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Ti+  for  TS 24.228§6.6
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IMS R4 Registration signalling flow - P-CSCF subscription for registration state event package - sequence chart for IMS R4-3. SIP NOTIFY request
  • S-CSCF1 sends a first NOTIFY request towards P-CSCF1 in order to inform P-CSCF1 about the registration status of the monitored user.