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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 ("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 the S-CSCF required capabilities and the I-CSCF uses this information to select a suitable S-CSCF.