[Freeswitch-users] Silence Suppression from an Audio Conference

[Markus von Arx]

Hi Steven

Thanks for your reply. I actually already know that wiki page. But all
those configuration variables there don't work - at least not for SIP
channels that are connected to a mod_conference audio conference. Maybe
they do work for bridged calls, but that's not what I need. Also, the wiki
page does not mention conferences at all. And the sentence "When FreeSWITCH
does not detect speech, it stops transmitting RTP" seems not to apply to
mod_conference.
​ I probably just have configured mod_conference incorrectly, but I don't
know where to check.

So any information or advice about SIP channels connected to a
mod_conference audio conference?

Thanks, Markus


2015-03-24 11:43 GMT+01:00 Steven Ayre <steveayre at gmail.com>:

> https://wiki.freeswitch.org/wiki/VAD_and_CNG
>
> On 24 March 2015 at 07:04, Markus von Arx <mkvonarx at gmail.com> wrote:
>
>> Hi
>>
>> Can anyone tell me if FreeSWITCH supports silence suppression for SIP
>> calls that are inside a FreeSWITCH audio conference? If yes, how do I
>> configure mod_conference, mod_sofia and FreeSWITCH core to enable this
>> feature?
>>
>> 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. 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.
>>
>> 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.
>>
>> Thanks, Markus
>>
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>
>
> _________________________________________________________________________
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> http://www.freeswitchsolutions.com
>
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> http://confluence.freeswitch.org
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>
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