[Freeswitch-users] Linksys PAP2-T and echo

[Darcy]

Here are the settings from a gateway in the field, we have about 200 of them 
installed with no echo compliants

fax port gain, in and out   -2
set
echo canc enable yes
echo canc adapt enable yes
echo supp eanble yes

Also, set silence supp enable to yes
   and silence threshold to medium.

Give that a try, I find it works quite well.  These adapters are service by 
a freeswitch with a 729 license.


-----Original Message----- 
From: Boris Kovalenko
Sent: Monday, October 31, 2011 12:42 PM
To: FreeSWITCH Users Help
Subject: Re: [Freeswitch-users] Linksys PAP2-T and echo

Hello!

Steve, Darcy, I've played ... no success :( Setting FXS to -15 do echo
acceptable but I still can hear it. So there is no way to eleminate echo
with Linksys devices? Only to buy more professional devices like Addpac?
> on your pap2t web interface, go to voice, advanced, select the line, the
> settings below will allow you to play with echo cancellation.  However, 
> you
> also need to go the the regional tab in voice and play with the fxs input
> and output gains, the voice gain on the pap2t or any linksys gateway, will
> impact the echo on the line.  This is most likely where your problem is.
> You might not be able to cure the echo on every call, but you should be 
> able
> to make it acceptable.
>
> Darcy
>
>
> Audio Configuration
> Preferred Codec:        Second Preferred Codec:
> Third Preferred Codec:        Use Pref Codec Only:
> Silence Supp Enable:        Silence Threshold:
> G729a Enable:        Echo Canc Enable:
> G723 Enable:        Echo Canc Adapt Enable:
> G726-16 Enable:        Echo Supp Enable:
> G726-24 Enable:        FAX CED Detect Enable:
> G726-32 Enable:        FAX CNG Detect Enable:
> G726-40 Enable:        FAX Passthru Codec:
> DTMF Process INFO:        FAX Codec Symmetric:
> DTMF Process AVT:        FAX Passthru Method:
> DTMF Tx Method:        DTMF Tx Mode:
> DTMF Tx Strict Hold Off Time:        FAX Process NSE:
> Hook Flash Tx Method:        FAX Disable ECAN:
> Release Unused Codec:        FAX Enable T38:
> FAX T38 Redundancy:        FAX Tone Detect Mode:
>
> -----Original Message-----
> From: Steve Underwood
> Sent: Monday, October 31, 2011 11:11 AM
> To: FreeSWITCH Users Help
> Subject: Re: [Freeswitch-users] Linksys PAP2-T and echo
>
> On 10/31/2011 10:58 PM, Boris Kovalenko wrote:
>> Hello!
>>
>>
>>        I'm wondering if it is possible to solve echo with Linksys PAP2-T
>> devices. Does anybody here uses it? I read many articles and still can't
>> understand how to eleminate echo :( I read
>> http://www.voip-info.org/wiki/view/Asterisk+echo+cancellation and found
>> that Asterisk has its own EC. Does Freeswitch has it too? I found this
>> article http://docs.freeswitch.org/echo_can_page.html but can't
>> understand - has Freeswitch EC or not? If yes - how to turn it on and 
>> off?
> Neither Asterisk or Freeswitch will echo cancel your PAP2T. Echo
> cancellation over IP is very problematic, and hardly ever attempted. The
> PAP2T should be echo cancelling for itself, and they usually do a fairly
> good job of this. I don't think it is configurable. Its always on.
>
> Steve
>
>
>
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-- 
С уважением,
   Борис Коваленко
   ЗАО "Тагнет"
   тел. +7 (3435) 230001
   факс +7 (3435) 230005



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