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

 

 

 

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IMS S1-7a. SIP 180 Ringing response (INVITE): from UE2 to P-CSCF2

S1-7a.  SIP 180 Ringing response (INVITE): from UE2 to P-CSCF2  (40 of 70)