[Asterisk-biz] Getting Crazy with ECHO .....

[andres at itranser.com]

Hi,

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.

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. 
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!)

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..... 

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 ?
Any suggestion will be welcome.

Kind Regards,

Andres
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