[Asterisk-Users] Static on TDM Zaptel FXO

[Gary Carr]

I have that exact setup and am getting a echo at the beginning of a inbound 
call. What gain settings work best for you?




Gary




Hello Bryce,
Gain settings do seem to have an effect.  I am going from a Cisco
7960>Asterisk>Zap TDM Card>POTS

Thanks,
Greg

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Bryce
Chidester
Sent: Wednesday, May 18, 2005 1:08 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Static on TDM Zaptel FXO

That type of echo is usually caused by incorrectly (or not at all) tuned
gain settings in zapata.conf. I don't know what kind of phones you're
using, but for Asterisk to even be able to detect DTMF tones on our
Sayson / Aastra 390s and 480s, our FXS channels are set to -5.0 on both
rx and txgain. If you're using externally-powered phones (as in not your
ordinary joe-schmoe analog phone), I have found that they're usually
pretty "hot" (loud) and Asterisk can't understand what is said.
Good luck!

Regards,
Bryce Chidester
Rhino Equipment Corp.
bryce at rhinoequipment.com        SIP: 305 at rhinoequipment.zapto.org
+1 (480) 940-1826 x305                IAX:
guest at rhinoequipment.zapto.org/305


On May 17, 2005, at 19:00, Gregory Wiktor - ADCom Corp. wrote:


> On a recompile of the kernel I now get a 99.98 average.
> Static is gone, although quality so far seems not quite there yet.
>
> I am also experiencing an odd local echo.  I can hear a slight echo
> locally, but the other end sounds fine, and the other end does not get

> echo.
>
> Even with the pots disconnected, you can hear it.  The static would be

> on all calls.  Hooking up a normal phone was ok.  The sip>sip phones
> are perfect too, it was only happening on the zap channel...
>
> Greg
>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Jeremy
> Parr
> Sent: Monday, May 16, 2005 8:05 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] Static on TDM Zaptel FXO
>
> On 5/16/05, Gregory Wiktor - ADCom Corp. <gw at adcomcorp.com> wrote:
>
>
>> Hello All,
>> I recently put in a zaptel 1fxo/1fxs card.  I am experiencing heavy
>> static.
>>
>> Even with the pots line disconnected, if I do a dial I still get
>>
>>
> static.
>
>
>> This way I know it's not the line, but rather something on the card.
>>
>> I tried alternate pci slots.
>>
>> This card has a power connector, does anyone know what the power
>> requirements are?  The unit is in a small case with a 2.4ghz p-4 and
>> 512mb ram, on an intel board with 533fsb.  All other functions are
>>
>>
> fine.
>
>
>>
>> I am using the latest CVS on Debian 2.6test
>>
>> Anyone experience this?
>>
>>
>
> Have you tried a different phone? Does the static appear immediately
> when you pick up the phone? Or on the second or third time?
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