[Freeswitch-users] Linksys PAP2-T and echo

[Boris Kovalenko]

Hello!

Played various parameters and echo still here. In other ways but still 
here. With silence suppression the echo persist if there is doubletalk. 
If only one is speaking there is no echo. The only what helps - I set 
FXS output to -15 and echo is gone. But remote party is quietly.
> Yes, if it is older we always upgrade it to the 5.1.6.   Also, when we do
> get an area where the echo is a little more difficult to cure, we use the
> spa2102, I do not know why but it seems to have more processing power, the
> fact that it will do t38 when the pap2t does not is probably an indication
> of the difference in two.
>
> Darc y
>
> -----Original Message-----
> From: Boris Kovalenko
> Sent: Monday, October 31, 2011 10:41 PM
> To: FreeSWITCH Users Help
> Subject: Re: [Freeswitch-users] Linksys PAP2-T and echo
>
> Hello!
>
>       Darcy, what is your firmware? 5.1.6?
>
>> 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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>>>
>>>
>>>
>>>
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>


-- 
С уважением,
   Борис Коваленко
   ЗАО "Тагнет"
   тел. +7 (3435) 230001
   факс +7 (3435) 230005