IMS R3-2a. SIP 200 OK response: from S-CSCF1 to P-CSCF1

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SIP ↠ Examples Grammars Presence ⇾ Main Services Transaction Dialog IMS

TS 24.228 – §6.5

IMS R3 signalling flow - UE subscription for registration state event package - IMS R3-2a. SIP 200 OK response: from S-CSCF1 to P-CSCF1

Expires: If the value of the Expires header in SUBSCRIBE request is different from the one received in REGISTER method, then the value of Expires header in the 200 (OK) response is set to match the value of Expires header in REGISTER method.