<div dir="ltr"><a href="https://wiki.freeswitch.org/wiki/VAD_and_CNG">https://wiki.freeswitch.org/wiki/VAD_and_CNG</a><br></div><div class="gmail_extra"><br><div class="gmail_quote">On 24 March 2015 at 07:04, Markus von Arx <span dir="ltr"><<a href="mailto:mkvonarx@gmail.com" target="_blank">mkvonarx@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:arial,sans-serif;font-size:12.8000001907349px">Hi</span><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:arial,sans-serif;font-size:12.8000001907349px"><br></span></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:arial,sans-serif;font-size:12.8000001907349px">Can anyone tell me if FreeSWITCH supports silence suppression for SIP calls that are inside a FreeSWITCH audio conference? </span><span style="font-family:arial,sans-serif;font-size:12.8000001907349px">If yes, how do I configure mod_conference, mod_sofia and FreeSWITCH core to enable this feature?</span></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:arial,sans-serif;font-size:12.8000001907349px">More precisely, I try to enable/activate the behavior described in RFC 3389 for G.711 in such a way that there are only RTP packets of type 13 every 1 or 2 seconds.</span><span style="font-family:arial,sans-serif;font-size:12.8000001907349px"> I tried to play around with some possible settings but could never observe anything else then the regular G.711 PCMU RTP packets on the wire. Even when I set the SIP call to 'deaf' via the FreeSWITCH console, mod_conference/mod_sofia continue to send G.711 PCMU RTP packets every 20ms.</span></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:arial,sans-serif;font-size:12.8000001907349px"><br></span></div><div class="gmail_default"><span style="font-size:12.8000001907349px">It's possible that I completly misunderstand RFC 3389 and the concepts of silence suppression, comfort noise etc. In the end, what I try to achieve is to reduce the network bandwidth of a G.711 SIP channel during the periods when the FreeSWITCH only sends silence over the SIP channel. Unfortunately, we're stuck with G.711 at the moment, so I cannot switch to another codec.</span></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:arial,sans-serif;font-size:12.8000001907349px">Thanks, Markus</span></div></div>
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