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

 

 

 

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IMS S4-5b. SIP UPDATE request (UE1 to UE2): from P-CSCF1 to S-CSCF1

S4-5b.  SIP UPDATE request (UE1 to UE2): from P-CSCF1 to S-CSCF1  (21 of 48)