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

 

 

 

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IMS S4-7b. SIP 180 Ringing response (INVITE): from BGCF1 to S-CSCF1

S4-7b.  SIP 180 Ringing response (INVITE): from BGCF1 to S-CSCF1  (29 of 48)