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S5.  IMS Session Initiation signalling flow —
mobile origination and termination in home network
terminating UE roaming and busy

 

 

 

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IMS S5-1a. SIP INVITE request (UE1 to UE2): from UE1 to P-CSCF1

S5-1a.  SIP INVITE request (UE1 to UE2): from UE1 to P-CSCF1  (2 of 14)