IMS R2-2a. SIP 200 OK response: from S-CSCF1 to I-CSCF1

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SIP ↠ Examples Grammars Presence ⇾ Main Services Transaction Dialog IMS

TS 24.228 – §6.3

IMS R2 signalling flow - Re-Registration: User currently registered - IMS R2-2a. SIP 200 OK response: from S-CSCF1 to I-CSCF1

Service-Route: S-CSCF1 inserts the Service-Route header that includes its own URI including a character string in the user part to differentiate mobile originating requests from mobile terminating requests.