[asterisk-users] Sound quality issue

[Cédric Lemarchand]

Le 15/01/11 20:50, Sevana Oy a écrit :
> Hello,
>
> Can you record audio at different locations on its route? Our
> experience would suggest (of course) using intrusive or non-intrusive
> perceptual voice quality evaluation at different parts of the network
> to localize the one where it drops down.
Yes we already do some records. We don't have access to the internal
network of the provider, so the network topology is quiet simple, only 2
sides :

Asterisk site <=> MPLS NETWORK (the provider) <=> remote site

Sound quality problems are present on both sent and received RTP flow.

>
>> Hello,
>>
>> Our Asterisk runs with multiple remote sites (12 over an MPLS network),
>> everything works fine except for the last site we have juste installed.
>>
>> When VOIP flows comes/goes from/to this site, there are sound quality
>> issues, persistent, 100% reproducible, on every call. This is not a
>> bandwidth or latency or jitter problem, everything is fine on the
>> network.
>> Our MPLS provider does all check on his network equipments, everything
>> is fine too, no packets loss recorded on routers's interfaces ect ...
>> We have, on our side, check and replace all the VOIP equipments (spare
>> rocks), an reduce the configuration to its simpliest (MPLS router <=>
>> ethernet cable <=> VOIP equipment), quality problem still there.
>>
>> I am sure there are RTP packets losses somewhere, except RTP debug in
>> the asterisk CLI, how can i determine where the problem come from ?
>>
>> Any help would be greatly appreciated, thx.
>>
>> Cédric