back to TS 24.228
- 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.