Feedback voice on Telepon line. How to Fix it?

General Help
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1

Hi,

I’ve problem with my telepon line, when the user call to destination number direct via dahdi (Interlokal).
it have any feedback from users voice ?

how to clear the feedback voice ?

Thanks you :smiley:

2

Tune your fxo lines for impedance matching (fxotune) , adjust your rx/tx gains and watch dahdi_monitor to verify balance with a decent milliwatt test number, use good hardware, if you don’t have echo cancelling hardware, use oslec.

3

Thanks for reply before @dicko.

but i dont know to change it. what it on chan_dahdi.conf ?
and i would like to upload my chan_dahdi.conf picture, and help me, what to change on my chan_dahdi.conf.

chan_dahdi.png557×543 7 KB

4

There is no possible answer for everyone, start with

man fxotune

this is not set in chan_dahdi.conf , it is a lower level tuning.

then search the forums for “milliwatt” you will find it all within. when rxgain/txgain are "balanced for a bidirectional milliwatt signal (perhaps different for each dahdi channel) , your problems will be significantly reduced.

5

I’ve seen some 2FXO 2FXS analog cards with hardware EC for around 200 dollars.

I had a lot of success with just using FXOTUNE.

http://www.voip-info.org/wiki/view/Asterisk+fxotune

6

Here’s some old notes from my /etc/rc.d/rc.local
Warning. We’re using FreePBX 12.x
This won’t work will all cards or installations.
The whole point of “tuning” is to tune for your individual site.

# Use fxotune -i, then edit /etc/rc.d/rc.local as follows :
# This tunes up the digium/dahdi fxo port/s to improve echo cancellation
# Must be included before amportal. See man fxotune for details

fxotune -s

#YMMV