[Asterisk-Users] Echo on Zaptel FXO :(

[Ian Chilton]

Hi Phil,

Thanks for the reply - comments below.

> Change fxsls to fxsks for the UK

I had fxsks until today but when I was playing with the gains to try and
fix this echo issue, I found that if I dial out the Zap to one of my
pstn->sip provider's numbers, it answered the cut off in a few seconds.
If I dial that number on the pstn line itself without going through the
Zap card it works fine. Someone suggested I change fxsks to fxsls and
thas indeed did fix that problem.


> I find rxgain=2.0, txgain=2.0 to be the sweet spots for my UK setup.  

Is that a BT line, or NTL/Telewest?

So did you have echo problems when you 1st set it up?

How did you find that 2.0 was the best?


> The aim is to get the monitor bars in ztmonitor to be at about half way  
> when talking.

I found that with calling 1471, the rx gain's showed as just below 1/2
way with some peaks above 1/2 way on some of the words and the txgain
was showing as 3/4 or more whatever I changed it too - even going to
things like -8.0 (I even tried -10.0 and the call was silent so that
must be too far!). I found this strange though, as with 0.0 the people
i'm calling complain that i'm quiet so shurly the txgain needs to go
up....


> Please also note that the X100/1P cards are not suitable for use in the  
> UK. They work on the American systems where the impedance is different  
> to the UK.

Is that the true X100/1P you mean? - i.e does that include my MD3200
chipset clone?

(I thought you just said you had it working well in the uk? - if so,
what are you using and is the quality good enough not to notice that you
are using anything different than a normal phone plugged into the line?)


> You may find that asterisk reports the Zap channel as being in a  
> strange ringing state: Add busydetect=no callprogress=no to solve this  
> (I found that I could not get the devices to answer the line without  
> these set: either on my BT line or NTL line.

Strange, dont seem to have had this problem - everything seems to work
fine except for the annoying echo I hear and the other end complaining
i'm quiet. I guess sticking them in can't harm though!

--ian