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S4.  IMS Session Initiation signalling flow —
mobile origination in home network
termination in CS network

 

 

 

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IMS S4-1a. SIP INVITE request (UE1 to UE2): from UE1 to P-CSCF1

S4-1a.  SIP INVITE request (UE1 to UE2): from UE1 to P-CSCF1  (2 of 48)