[asterisk-users] Intermittent busy tone detection on loopback setup

Steve Totaro
Tue, 07 Aug 2007 16:15:57 -0000

Either your configs are wrong or the card is faulty. You should have
crystal clear calls.

Thanks,
Steve

Manish Sapariya wrote:
> Hi List,
>
> I am using asterisk to test another asterisk/voip software, by
> generating user agent on asterisk which can be used to place
> calls to unit under test. I have also tests in which I place
> calls over PSTN lines and receive them back on PSTN line and
> verify the results.
>
> Everything is fine, except some times asterisk sees busy tone
> on callee side when the caller side plays the audio file, for
> pstn call. To understand the problem I ran simple test by using
> a loopback cable from fxs to fxo, repeatedly. What I found is that
> the received file indeed was so distorted and had some busy tone
> like sounds that asterisk identified it as busy tone and hanged
> up the line.
>
> There are following questions that I am trying to answer:
> - Why the busy like distortion is generated on the PSTN line?
> - When I recorded the wav files to see the actual quality of
> the voice I found them not very good. My assumption was that
> the loopback setup should give the best result possible. Did
> I misunderstand anything?
> - Will PSTN hardware, I have digium cards, cause such intermittent
> noise generation when use repeatedly to place calls.
>
> Any ideas?
>
> Thanks and Regards,
> Manish
>
>
>
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