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R2.  IMS Registration signalling flow —
Re-registration – User currently registered

 

 

 

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IMS R2-1e. SIP REGISTER request: from I-CSCF1 to S-CSCF1

R2-1e.  SIP REGISTER request: from I-CSCF1 to S-CSCF1  (6 of 10)

Upon receiving this request S-CSCF1 will detect that it already has a registration record for UE1 and will reset its SIP registration timer for UE1 to the Expires time in this request.