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S1.  IMS Session Initiation signalling flow —
mobile origination and termination roaming
with different network operators

 

 

 

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IMS S1-4c. SIP 200 OK response: from S-CSCF2 to S-CSCF1

S1-4c.  SIP 200 OK response: from S-CSCF2 to S-CSCF1  (24 of 70)