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

 

 

 

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IMS S1-1b. SIP INVITE request (UE1 to UE2): from P-CSCF1 to S-CSCF1

S1-1b.  SIP INVITE request (UE1 to UE2): from P-CSCF1 to S-CSCF1  (3 of 70)