[Freeswitch-users] Linksys PAP2-T and echo

[Boris Kovalenko]

Hello!

     Steve, my configuration is:

PAP2-T (A) ---- FreeSwitch --- PAP-2T (B)
I tried Freeswitch in all modes: default, proxy_media, bypass_media. The 
echo is always present. User A hears its own echo, and user B hear its own.

> Hi,
>
> The echo canceller in the SPA3102 is a disaster, but the ones in the
> PAP2T and SPA2102 shouldn't give you problems. If you use the default
> gains you shouldn't really notice echo. If you set some wild gains you
> might bee poor results. Are you sure the echo originates from the PAP2T,
> and not some other part of the signal chain?
>
> Steve
>
>
> On 11/01/2011 12:42 AM, Boris Kovalenko wrote:
>> 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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>
>
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-- 
Regards,
Boris