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S3.  IMS Session Initiation signalling flow —
origination in CS Network
mobile termination in home network

 

 

 

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IMS S3-1b. SIP INVITE request (UE1 to UE2): from I-CSCF1 to S-CSCF2

S3-1b.  SIP INVITE request (UE1 to UE2): from I-CSCF1 to S-CSCF2  (3 of 48)