<br><font size=2 face="sans-serif">Hi,</font>
<br>
<br><font size=2 face="sans-serif">I have a customer having an AVM ISDN
Bri-Card installed on his Asterisk. That Asterisk is serving 8 digital
ISDN lines plus several voIP channels and a Mobile Trunk.</font>
<br>
<br><font size=2 face="sans-serif">I have no problem on the voIP channels
(they quality is ok) neither on the mobile trunk. However, I am experimenting
some ECHO on the ISDN lines that is very disturbing. </font>
<br><font size=2 face="sans-serif">I try to set up several echo filters,
and compiled CAPI with options to avoid it, but I should be missing something.
The line that should work better (the ISDN interface with the PSTN)
is the one that works worse. It is very extrange, but ECHO is random.
I have some calls that sound great, but other ones are terrible bad.. (so
problem is not on the phones!)</font>
<br>
<br><font size=2 face="sans-serif">I am getting crazy trying to known the
cause. I though it was due the other side (in fact, problems are always
with the same numbers), but If I use a normal phone, echo is disapearing,
so it seems it is a combination of my my ISDN card and some lines.....
</font>
<br>
<br><font size=2 face="sans-serif">I was googling and looking at foros
trying to find something relationated with ECHO, European ISDN lines, and
Asterisk, and I find some post with a similiar problem that I had (they
were mentionating that signaling on European lines may have a little difference)
but no conclussions anywhere. Can any one please give me any
hint or suggestion ? Should I try another ISDN card or other compilation
options ?</font>
<br><font size=2 face="sans-serif">Any suggestion will be welcome.</font>
<br>
<br><font size=2 face="sans-serif">Kind Regards,</font>
<br>
<br><font size=2 face="sans-serif">Andres<br>
</font>