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

 

 

 

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IMS S1-3c. SIP PRACK request (UE1 to UE2): from S-CSCF1 to S-CSCF2

S1-3c.  SIP PRACK request (UE1 to UE2): from S-CSCF1 to S-CSCF2  (18 of 70)