Hi Boris, what kind of analogue handsets do you have attached to the PAP2-T's? I have found with other ATA's (mostly Grandstreams) that it is the impedance settings for the handset that contributes the most to echo. Different handsets can be seup for different countries and sometimes you have to adjust the ATA to match. Regards Brian On 01/11/2011 02:39, Boris Kovalenko wrote:
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