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Ti+  for  TS 24.228§6.2
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IMS R1 signalling flow - Registration: User not registered - IMS R1-1d. SIP REGISTER request: between I-CSCF1 and HSS
  • Cx-Query, or Diameter UAR: User-Authorization-Request: I-CSCF1 makes a request for information related to the Subscriber registration status by sending the private user identity ("user1_private@home1.net"), public user identity ("user1_public1@home1.net") and visited domain identifier ("Visited Network Number 1") to the HSS.
  • Cx-Query response, or Diameter UAA: User-Authorization-Answer: The HSS returns S-CSCF required capabilities and I-CSCF1 uses this information to select a suitable S-CSCF.