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IMS Registration signalling flow —
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R1-3d.  SIP REGISTER request, with credentials: between I-CSCF1 and HSS  (16 of 22)

I-CSCF1 requests information related to the Subscriber registration status by sending the private user identity, public user identity and visited domain name to the HSS. The HSS returns the S-CSCF name which was previously selected in step 1d.