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

 

 

 

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IMS S4-7a. SIP 180 Ringing response (INVITE): from MGCF1 to BGCF1

S4-7a.  SIP 180 Ringing response (INVITE): from MGCF1 to BGCF1  (28 of 48)