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

 

 

 

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

S4-1b.  SIP INVITE request (UE1 to UE2): from P-CSCF1 to S-CSCF1  (3 of 48)