IMS S4-5b. SIP UPDATE request (UE1 to UE2): from P-CSCF1 to S-CSCF1

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SIP ↠ Examples Grammars Presence ⇾ Main Services Transaction Dialog IMS

TS 24.228 – §7.2.3 – §7.3.6 – §7.4.4

IMS S4 signalling flow - Session Initiation: Mobile origination in home network, Termination in CS network - IMS S4-5b. SIP UPDATE request (UE1 to UE2): from P-CSCF1 to S-CSCF1

P-Charging-Vector: The P-CSCF added the GPRS access network information to this header, which is removed and stored by the S-CSCF.