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

 

 

 

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IMS S1-5a. SIP UPDATE request (UE1 to UE2): from UE1 to P-CSCF1

S1-5a.  SIP UPDATE request (UE1 to UE2): from UE1 to P-CSCF1  (28 of 70)