asterisk users - Dec 2006 - fxotune unable to set impedence

My SM56 (Motorola X100P clone) has echo as hight as 38%, according to 
fxotune -d.  But when trying to take action, it fxotune simply says it 
can't.

./fxotune -i3 -vvvv
Running with parameters:
        doset=0
        docalibrate=1
        dodump=0
        startdev=1
        stopdev=252
        calibtype=2
        waveformtype=-1
        delaytosilence=0
        silencegoodfor=18
        dialstr=5
        debug=4
Tuning module /dev/zap/1
Unable to set impedance on fd 4
Failure!
------------------

How can I fix this?  Or does fxotune only tune TDM400?  (My TDM400P shows a 
mere 1.2% echo.)  Could it do "authentic" X100P?

I use zaptel-1.2.10, fxotune.c Rev. 1348.

Yuan Liu

>From: "Yuan LIU" <yliu11@hotmail.com>
>
>How can I fix this?  Or does fxotune only tune TDM400?  (My TDM400P shows a 
>mere 1.2% echo.)  Could it do "authentic" X100P?
I just didn't want to accept fxotune.c's claim about working only with
TDM.
Several other users indicated that they were not able to tune X100P.  
There's also a README.debian note that specifically indicated exclusion of 
X100P.

Yuan Liu