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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: between I-CSCF1 and HSS
  • Cx-Query, or Diameter UAR: User-Authorization-Request: The I-CSCF makes a request for information related to the Subscriber registration status by sending the private user identity (""), public user identity ("") and visited domain identifier ("Visited Network Number 1") to the HSS.
  • Cx-Query response, or Diameter UAA: User-Authorization-Answer: The HSS returns the S-CSCF required capabilities and the I-CSCF uses this information to select a suitable S-CSCF.