[asterisk-r2] The call audio suddenly becomes screeching noise after random amount of seconds (MFCR2 claro argentina)

[Latre]

Check your BIOS, maybe you have a share IRQs, disable COMs and LPT1, and
all unnecessary things.

 Revisa que en el bios no tengas habilitados seriales, lpt1, audio o esas
cosas que realmente no usas.

Si las tarjetas son PCI puede provocar problemas.

Intenta con solo una.

On Fri, Aug 5, 2016 at 2:09 PM, <soporte at monssa.com.ar> wrote:

> Hello, I'm new to this list and to some extent, to asterisk. If you want
> to reply in spanish, do it; or for me to explain someting in spanish, let
> me know.
>
>
> I'm having this problem:
> In my workplace, I was tasked with replacing the functioning
> asterisk-freepbx PBX running old versions of debian and asterisk, for a new
> asterisk PBX w/o freepbx.
> The PBX had a couple of OpenVox analog cards, which didn't give me any
> major trouble, and a digital D210P card, connected to a MFCR2 line from
> Claro(telmex). I'm in Argentina. The digital lines were working.
> When building the new pbx, I took the digital card from the old one and
> tested it in the new one, I got it working, tried some calls and everithing
> was good, aparently.
> Then, when we moved the new pbx into production, people started
> complaining the calls would cut with noise, or some other people tought a
> fax machine or modem took over the line, because the calls would connect,
> the two parties were able to talk, but after some time (not a fixed amount
> of time, most of the time about 1 or 2 min, sometimes more) both parties
> stopped listening to eachother but a high pitched noise, similar to
> acoustic feedback or the screech of analog modems when they try to
> communicate, but the noise was digital in nature, not analog, not feedback,
> it was constant in volume and didn't alter when speaking into mic, or over
> time.
> To test without having the other lines drop everytime we had to
> reconfigure dahdi or restart the system, we moved the card to a test box
> (the hardware from the old PBX being replaced, but a new disk with the same
> system as the new one, devuan jessie).
> We got the card and the mfcr2 line working, made test calls and the random
> noise was still present.
> We checked dahdi_tool for IRQ misses, at the same time the noise appeared,
> and nothing (0) misses.
> We disabled echo cancelling, with no success.
> We tried changing the balun, with no success.
> We tried using the same version of DAHDI as the old working box (2.4.1)
> with no success.
> We used dahdi_monitor to check the levels, and when the noise appears, the
> TX still shows the level of the call sent by asterisk (for example, if we
> let the call play MOH forever, we see the MOH levels on TX), but on RX we
> see the level of the noise received (2032 is the value of the noise, always
> constant, doens't matter of the other party is silent or yells in the mic,
> when the noise starts it continues always constant).
> We run the dahdi_test tool and we always get like 99,999%
> We tried to stress the CPU during a call to trigger the noise, without
> success.
> We monitored the mfcr2 channel log during the call, but when the noise
> appears, nothing comes up... like the call was still normal, in a sense
> that's true because the call is still stablished, but both parties hearing
> a noise (that I dont know where it comes from..). When one of the parties
> hungs up, then I get the event in the log file, like normal.
> We used the same configuration parameters as the old working PBX, if you
> need them I'll paste the system.conf or chan_dahdi.. but I don't think
> they're the problem, because we can get all the channels up and running.
>
> Now in the test box im running:
>
> pruebatrama*CLI> mfcr2 show version
> OpenR2 version: 1.3.3, revision: (release)
>
> pruebatrama*CLI> dahdi show version
> DAHDI Version: 2.4.1.2 Echo Canceller:
>
> pruebatrama*CLI> core show version
> Asterisk 13.11.0-rc1 built by asterisk @ pruebatrama on a i686 running
> Linux on 2016-08-04 17:43:00 UTC
>
> I'm running the old dahdi version because it's the same the old working
> pbx had running. It's the dahdi distributed by openvox and installed
> according to the card manual:
> http://www.openvox.cn/pub/manuals/Release/English/D210P%20DE
> 210P_on_DAHDI_User_Manual.pdf
> We initially tried the current 2.11 release but it didn't work at all. The
> previous 2.10 did work (with the same noise problem), but then I replaced
> it with the 2.4 to test.
>
> Let me know if there is some information I left out...
>
> Thanks in advance.
>
> Julian.
>
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