Title: holding time

Hello,
   I have a question,
   form RFC 3621, BYE message are send directly form CALLER to CALLEE.
   normaly,  UAS will not know when the call was released. so , UAS will not know how long the call holding .
   but when I use ONDO sip server 2.0 , it do report the holding time for each call.
I wander , how can ONDO server get this information.


best regards
Li Yufeng

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