opus - Sep 2016 - Opus DTX support

Hi,

I want use opus DTX to save bandwidth in my half duplex VOIP project,
so i require help for below questions

1)what is opus DTX and documents to study DTX.
2)if opus DTX is enable do i need send comfort noise or completly drop
silence detected frame.
3)How extactly OPUS DTX works with RTP protocol.
4) how to test with OPUS demo binary

Thanks & Regards
Vittalprasad B R
8722397247