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Hello Ahmed,<br>
<br>
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IMHO the best solution is policy:<br>
<br>
1) gather statistics from your CDRs (FreeSWITCH has lots of variables<br>
that you can use in your CDRs)<br>
2) place test calls in cases where the stats show a possible problem<br>
3) send a trouble ticket to the offending carrier in cases of FAS<br>
and<br>
4) stop using the route until the "problem" is fixed.<br>
<br>
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<div>I hear what you're saying. And how much is the time and man
effort involved in manually dealing with this ?<br>
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Unfortunately, it is a lot of work. In fact it is a 24x7 manual work...
What makes things a bit easier is that a FAS route will have a short
setup-connect delay, and statistics will definitely show a heavily
FASed route, although a route with a small percentage of FAS will still
go under the radar. And of course, using statistical methods doesn't
give you results in real time...<br>
<br>
We have experimented with tone_detect app as Anthony Minesalle
suggested for detecting tones to apply to FAS problems and it works
very well. But after a while we dropped the whole FAS detection idea
because of the so many different FAS scenarios out there... Plus, quite
a few methods that monitor audio involve decompressing the incoming
audio before processing it. This means that you need to have audio
transcoding on FS, which a bad things in terms of perceived audio
quality and CPU power/scaling. In that case you would almost certainly
need quite a few G729 codec licenses, as most carriers use this codec
to send you their traffic.<br>
<br>
Nonetheless if you want to pursue this and you need help I'd be happy
to assist, as FAS is a huge problem for carriers.<br>
<br>
Best regards,<br>
Vlasis.<br>
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