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

R1-4b.  SIP 200 OK response: from I-CSCF1 to P-CSCF1  (21 of 22)

  • I-CSCF1 forwards the 200 (OK) response from S-CSCF1 to P-CSCF1 indicating that the registration was successful.
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  • P-CSCF1 saves the value of the Service-Route header and associates it with UE1.