IMS R7-1f. SIP REGISTER request (via P-CSCF2): between S-CSCF1 and HSS

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IMS R7 Registration signalling flow - Network-initiated deregistration upon UE roaming and registration to a new network - IMS R7-1f. SIP REGISTER request (via P-CSCF2): between S-CSCF1 and HSS

S-CSCF1 notifies the HSS to update its location information for that subscriber. The HSS sends a response to S-CSCF1 to acknowledge the update of location information and also with the user profile.