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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 S5-2e. SIP 486 Busy Here response: from S-CSCF1 to P-CSCF1, followed by ACK

S5-2e.  SIP 486 Busy Here response: from S-CSCF1 to P-CSCF1, followed by ACK  (13 of 14)