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

 

 

 

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IMS S3-3b. SIP PRACK request (UE1 to UE2): from S-CSCF2 to P-CSCF2

S3-3b.  SIP PRACK request (UE1 to UE2): from S-CSCF2 to P-CSCF2  (13 of 48)