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Ti+  for  TS 24.228§6.3
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IMS R2 signalling flow - Re-Registration: User currently registered - IMS R2-1c. SIP REGISTER request: from P-CSCF1 to I-CSCF1
  • P-CSCF1 removes the Security-Client header and associated "sec-agree" option-tags prior to forwarding the request. As the Proxy-Require header is empty, it removes this header completely.
  • Path: This is P-CSCF1 URI and is included to inform S-CSCF1 where to route terminating requests.
  • Require: This header is included to ensure that the recipient correctly handles the Path header. If the recipient does not support the path header, a response will be received with a status code of 420 and an Unsupported header indicating "path". Such a response indicates a misconfiguration of the routing tables and the request has been routed outside the IM CN subsystem.
  • P-Visited-Network-ID: It contains the identifier of P-CSCF1 network at the home network.
  • P-Charging-Vector: P-CSCF1 inserts this header and populates the icid parameters with a globally unique value.