Re: [Linphone-developers] DTX / VAD for Speex in linphone

[w4]

Ok,

good to know that there should be fewer packets. Then my configuration
must be faulty...Anyway, i can't see nothing wrong in the SDP INVITE or
OK response...

INVITE part (Linphone/3.9.1 (belle-sip/1.4.2) git version on Kali linux)

v=0
o=linphone 3447 4091 IN IP4 yyy.yyy.yyy.yyy
s=Talk
c=IN IP4 yyy.yyy.yyy.yyy
t=0 0
a=rtcp-xr:rcvr-rtt=all:10000 stat-summary=loss,dup,jitt,TTL voip-metrics
m=audio 7078 RTP/AVP 96 101
a=rtpmap:96 speex/8000
a=fmtp:96 vad=on
a=rtpmap:101 telephone-event/8000
a=rtcp-fb:* trr-int 5


OK response part...(Linphone/3.5.2 (eXosip2/3.6.0) repository version on
debian stable - no opus here btw (?))

v=0
o=linphonetoo 3636 3636 IN IP4 xxx.xxx.xxx.xxx
s=Talk
c=IN IP4 xxx.xxx.xxx.xxx
t=0 0
m=audio 7078 RTP/AVP 96 101
a=rtpmap:96 speex/8000
a=fmtp:96 vad=on
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-11

I don't have to use Speex (it was simply the codec i tested first).

BTW, Does Linphone offer some kind of generic VAD for codecs which don't
have it built-in, like PCMA/U?

My purpose is to do some research on VAD-related attack vectors, but
without VAD/DTX i can't do testing, so yes, i would really like to turn
it on ;)

Best,
Anne






On 08.08.2016 22:41, Johan Pascal wrote:
> Hi,
> 
> speex codec directly manages the VAD/DTX as long as you use vbr=on or
> vbr=vad in your fmtp parameter, can you check these parameter is
> correctly set in the SDP INVITE and peer response to the invite ? During
> silence you shall have fewer and smaller packets.
> 
> By the way, speex is now superseded by opus, why do you need to use speex?
> 
> regards,
> 
> johan
> 
> 
> On 08/08/16 17:41, address@hidden wrote:
>> Hi list,
>>
>> I don't know if developers are on the users list as well, so i would
>> like to ask almost the same question here again and i hope you don't
>> hold it against me:
>>
>> I am trying to get VAD working in linphone, but i fail. Or maybe i
>> misunderstood the concept?
>>
>> When i try to activate VAD (vbr=vad, vad=on) for Speex in the linphonerc
>> speech pauses don't result in fewer packets being sent. Only the RTP
>> payload is smaller during silence. Is this already VAD? Then i am
>> missing DTX i guess?
>>
>> So, is there any possibility to use DTX in linphone, ideally together
>> with VAD?
>>
>> Best,
>> Anne
>>
>>
>> _______________________________________________
>> Linphone-developers mailing list
>> address@hidden
>> https://lists.nongnu.org/mailman/listinfo/linphone-developers
> 
> 
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