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

 

 

 

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IMS S3-1a. SIP INVITE request (UE1 to UE2): from MGCF1 to I-CSCF1

S3-1a.  SIP INVITE request (UE1 to UE2): from MGCF1 to I-CSCF1  (2 of 48)