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SIP ↠  ExamplesGrammarsPresence ⇾  MainServicesTransactionDialogIMS
TS 24.228§6.5   List   Prev   Next
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IMS R3 signalling flow - UE subscription for registration state event package - IMS R3-1b. SIP SUBSCRIBE request: from P-CSCF1 to S-CSCF1
  • P-CSCF1 removes the Security-Verify header and associated "sec-agree" option-tags prior to forwarding the request. As the Require and Proxy-Require headers are empty, it removes these headers completely.
  • P-Asserted-Identity: P-CSCF1 inserts the SIP URI in the P-Asserted-Identity header field and it also removes P-Preferred-Identity header field.
  • P-Access-Network-Info: This header contains information from the UE.
  • P-Charging-Vector: P-CSCF1 inserts this header and populates the icid parameters with a globally unique value.