View Full Version : Echo on Epygi 4x FXO Calls

12-10-2006, 07:12 AM

I seem to be having an echo problem on an Epygi 4x on FXO calls. SIP Calls are perfect. I have experimented with the echo trail on fxoconfig.cgi

The problem seems to be when a call converts from SIP to PSTN. If I connect a phone to a FXS port and make a call; it's clear. (NO ECHO)



12-11-2006, 10:18 AM
What IP phones are you using?

12-13-2006, 01:14 PM
Experiencing the same problem on a customer's Quadro16x.
Using Aastra 9133i.
Still testing with the echo trail values.

12-17-2006, 04:26 AM
We used to experience echo issues with the Aastra phones. But it was a phone issue more than Quadro issue.

You may want to try turning down the MIC gain on the Aastra phones.
This can not be set in the phone GUI, and can only be done through
config files and a TFTP server. The phones administrator manual has
more info.

12-28-2006, 01:14 AM
Anyone have a detailed fix for the echo problem on the 9133i? I cannot find the MIC setting on the 9133i.

12-29-2006, 03:28 AM
I have the same problem -- echo on FXO calls using Aastra phones. I've adjusted receive and transmit levels and echo trail but these so far have not cured the problem. Ruben has asked me to capture some logs. We'll see what he comes up with.

01-07-2007, 05:28 AM
In a mac.cfg file add these lines:

handset tx gain: 0

handset sidetone gain: -10

headset tx gain: 0

headset sidetone gain: -10

handsfree tx gain: 0

Generally setting the sidetone gain to the lowest value (-10) does the trick, but you may want to experiment.

These values can only be applied in the config file, so you will need a TFTP program to load these.

01-29-2007, 10:24 AM
After reviewing the posts and making the changes suggested (sidetone gain), I still have an issue with SIP to FXO calls. The caller on the FXO side doesn't hear the echo. The caller on the SIP side hears him/herself -- it's quite distracting.

I'm using the Aastra 480i phones. Any additional insight would be greatly appreciated.

Thanks, -Jim


02-03-2007, 03:52 AM
Jim, please apply to technical support. They will help you out with fixing the issue. You can try also to reduce the transmit gain on FXO port of Quadro (Telephony -> Gain control). The default is 0 and you can try -3 to see if it helps.

02-05-2007, 03:35 AM
Thanks, I have an open ticket with tech support. I've taken traces and they've confirmed an issue. I'm told to expect a fix soon. Hope this helps others....

02-07-2007, 12:02 PM
Let us know how you went jevex, I have the same issues but with Snom 320 phones.

02-07-2007, 01:17 PM
I've installed the special build of the 4.0.10 that was provided by tech support to address the echo issue(s) noted in my trace files -- still not resolved. This is very frustrating to the users.

I'm currently working through my equipment provider; however, the process is too slow. I've tried the adjusting the gain control on the 2x and on the Aastra 480i's to no avail. I'm looking forward to the next step with Epygi tech support.

My config (completely LAN connected - no Wan/Wireless)

Q2x running 4.0.10/Special_Fix (fully licensed).
FXO GW running 3.1.10/Release (also exhibiting the issue - excluded as a part of the troubleshooting)
Aastra 480i phones running 1.4.1 (11/2006) code. Sip to Sip works extremely well via LAN,Wireless, and SoHo.
No echo on analog lines terminating on the block, telco confirmed while testing. Echo always on on the Sip side of the Sip to FXO call.[/list]

I don't want to throw this solution away as I took this solution's reliability / qualityon faith from someone closer to the product.

818.241.5656Edited by: jevex2010

02-07-2007, 11:21 PM

I'll try to give you a call on mentioned number today and try to work with you.


02-09-2007, 02:51 AM
Update on the testing:

Confirmed gain settings on Aastra 480i are all the way down (in the config file).
Confirmed gain settings in the Q2x (FXO) are all the way down.
Updated the Q2x to 1.4.18/Release.
Tested Aastra 480i SIP to SIP - fine. Tested Aastra 480i Sip to PSTN - echo problem still exists.
Tested Cisco 7960 SIP to SIP - fine. Tested Cisco 7960 SIP to SIP - echo problem still exists.
Reconfirmed totally bypassing the Q2x w/analog phone - no echo.[/list]

Expected next step:

Epygi tech support to directly access to Q2x to understand / troubleshoot the issue further.[/list]

Users are still frustrated. Belated thanks to tech support for the response they put this problem.I look forward to a quick resolution.


818.679.3410 (cell)
818.241.5656, x286

02-15-2007, 12:26 AM
Update on testing:

Tech support has remote access to the 2x and is able to experience the problem.
We've played with the gain settings on both the phone and the quadro. The echo issues still exists on the SIP side of the PSTN call.
The sense from tech support is there is a gain / signal strength issue between the CO and the 2x. They have tried accomodating this in 3 image builds now. I'm not sure what the next step is.
By comparison, I've tested the CO and infrastructure with a higher-end 3Com solution (V3000) and did not experience any issue with echos. In fact it's quite clear.[/list]

At this point, I'm hopeful about resolving the issue. Otherwise, I will have to return / dump the solution. We'll see.

I appreciate the time tech support is spending on this...


02-15-2007, 07:22 AM
I wonder how will that effect my 4X/Snom 320 scenario...

02-19-2007, 06:06 AM
Testing Update:

Tech support is still working on the issue. I believe they can see the problem andare working on the best way to address it.

They changed the local setting from So Cal, USA to Germany (My understanding is Germany is known to have a reputation for echo issues). The presets in this local seem to reduce the echo problem on my Q2x to an almostacceptable level. If I concentrate, I can stillhear a slight echo.

I've tried it without the phone gain adjustments (default), and the problem gets a little worse. I put the gain settings back in the config and the problem is less worse.


-JimEdited by: jevex2010

02-21-2007, 12:23 AM
Testing Update:

Epygi Tech Support was able to resolve the echo issue on my Q2x (which basically means accommodating the particulars of my CO). Now they will work on my FXO GW to do the same. I will continue to update this thread with the results.

For those of you who have this kind of problem, Epygi tech support encourages you to open individual issues with them so they can understand, validate, and resolve the issue(s). It may take a little time to fine tune the Quadro to match the settings of your CO (at least this is my experience).


05-15-2007, 01:40 AM
i have the problem with the echo in port FXO,i have snon 320 and 300 quadro4x, what is the resolution for that?