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

[Danny Zak]

Hello andres,

have you already tried to jungle with the tx and rx gain ?

it is default at 0.8 ; we had similar issues here in our testlab with
this



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Friday, October 29, 2004, 12:19:01 AM, you wrote:


aic> Hi,

aic> I have a customer having an AVM ISDNBri-Card installed on
aic> his Asterisk.  That Asterisk is serving 8 digitalISDN lines plus
aic> several voIP channels and a Mobile Trunk.

aic> I have no problem on the voIP channels(they quality is ok)
aic> neither on the mobile trunk. However, I am experimentingsome ECHO
aic> on the ISDN lines that is very disturbing. 
aic> I try to set up several echo filters,and compiled CAPI with
aic> options to avoid it, but I should be missing something. The line
aic> that should work better (the ISDN interface with the PSTN)is the
aic> one that works worse.  It is very extrange, but ECHO is random.I
aic> have some calls that sound great, but other ones are terrible
aic> bad.. (soproblem is not on the phones!)

aic> I am getting crazy trying to known thecause. I though it
aic> was due the other side (in fact, problems are alwayswith the same
aic> numbers), but If I use a normal phone, echo is disapearing,so it
aic> seems it is a combination of my my ISDN card and some lines.....

aic> I was googling and looking at forostrying to find something
aic> relationated with ECHO, European ISDN lines, andAsterisk, and I
aic> find some post with a similiar problem that I had (theywere
aic> mentionating that signaling on European lines may have a little
aic> difference) but no conclussions anywhere.  Can any one please
aic> give me anyhint or suggestion ? Should I try another ISDN card or
aic> other compilationoptions ?
aic> Any suggestion will be welcome.

aic> Kind Regards,

aic> Andres