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S5.  IMS Session Initiation signalling flow —
mobile origination and termination in home network
terminating UE roaming and busy

 

 

 

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IMS S5-1c. SIP INVITE request (UE1 to UE2): from P-CSCF1 to S-CSCF1

S5-1c.  SIP INVITE request (UE1 to UE2): from P-CSCF1 to S-CSCF1  (4 of 14)