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

 

 

 

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IMS S3-7a. SIP 180 Ringing response (INVITE): from UE2 to P-CSCF2

S3-7a.  SIP 180 Ringing response (INVITE): from UE2 to P-CSCF2  (28 of 48)