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IMS Registration signalling flow —
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IMS R1-4a. SIP 200 OK response: from S-CSCF1 to I-CSCF1

R1-4a.  SIP 200 OK response: from S-CSCF1 to I-CSCF1  (20 of 22)

  • S-CSCF1 sends a 200 (OK) response to I-CSCF1 indicating that Registration was successful.
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  • S-CSCF1 inserts the Service-Route header that includes its own URI including a character string in the user part to differentiate mobile originating requests from mobile terminating requests.