[Freeswitch-users] Choopy one-way noise

[Anthony Minessale]

You should choose your subject more carefully mentioning Sangoma or
FreeTDM in the subject to attract the attention of Moy


On Thu, Mar 1, 2012 at 8:45 AM, Christian Benke <benkokakao at gmail.com> wrote:
> Hello!
>
> On a box with a Sangoma A500 BRI card i have a serious audio quality
> problem. The "outside"-leg of a call hears a choppy robotic noise,
> it's difficult to understand the actual voice. I hope someone
> recognizes this issue, as i have tried several approaches and so far i
> neither know what causes the problem nor where it is caused exactly.
>
> Here's a sample file(The noise is not very noticeable, it's the
> oscillating hum you hear in the background, the short voice-sample you
> hear is mine, but it's inbound so it's not affected):
>
> http://poab.org/test1.wav
>
> If the call is set on-hold or if there's a playback/moh, the quality
> for the outside-leg is fine while there's no two-way-audio, so my
> assumption was that it's some kind of problem with codecs or
> transcoding. Capturing the RTP-Stream from the phone to the server
> proved though that the quality is fine before it arrives at FS(There
> are no audio problems on internal calls as well).
>
> Here's what else i've tried without success:
> - set disable-monotonic-timing to true
> - started FS with the -rt Flag(As well as -waste and -heavy-timer)
> - jitter "time_test" 100 100 responds with avg 130(Thats fine right?)
> - rearranged the codec-settings of the phone(Sangoma SPIP 450) to give
> A-law the highest priority
> - high-precision-timer is available in the kernel according to dmesg
> and /proc/timer_list (kernel is 2.6.32-5-686 on debian 6.0)
>
> Sangoma's Support appears to be clueless as well, they didn't have
> effective suggestions so far(Opened a ticket 2 weeks). Since i don't
> have this problem with identical hardware without
> Sangoma-Cards(SIP-Trunk instead), my first assumption was the card.
> Probably an interrupt issue?
>
> Any suggestions would be highly appreciated, i'm a bit at loss now and
> only know more drastic next steps(Replacing ISDN-Modules or the whole
> hardware).
>
> Best regards,
> Christian
>
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-- 
Anthony Minessale II

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