[Asterisk-Users] Very bad quality with AVM Fritz!card PCI and chan_capi

[Benjamin Sebbah]

Hi everyone,

I have Asterisk SVN-trunk-r7498 running for a few months and I'm quite
happy with it. However, I am experiencing a quality issue with my AVM
Fritz!card PCI which is used with chan_capi. When somebody calls me on
this line he hears a lot of noise and I hear "scratches" and "plops". It
is very annoying. Below is is my /etc/asterisk/capi.conf 
I've tried to play with echotail and echosquelch but the quality is
always terrible. 

Any suggestion is welcomed.

Thanks,

Ben

</etc/asterisk/capi.conf>
[general]
rxgain=0.5
txgain=0.5
language=fr      ;set default language
;ulaw=yes        ;set this, if you live in u-law world instead of a-law
[ISDN1]

isdnmode=DID     ;'MSN' (point-to-multipoint) or 'DID' (direct inward dial)
                 ;when using NT-mode, 'DID' should be set in any case
incomingmsn=*    ;allow incoming calls to this list of MSNs/DIDs, * = any
controller=1     ;capi controller number to use
group=9          ;dialout group
softdtmf=on      ;enable/disable software dtmf detection, recommended
for AVM cards
relaxdtmf=on     ;in addition to softdtmf, you can use relaxed dtmf
detection
accountcode=     ;Asterisk accountcode to use in CDRs
context=capi-in  ;context for incoming calls
;echosquelch=2   ;_VERY_PRIMITIVE_ echo suppression
echocancel=yes  ;EICON DIVA SERVER (CAPI) echo cancelation
                 ;(possible values: 'no', 'yes', 'force', 'g164', 'g165')
echocancelold=no ;use facility selector 6 instead of correct 8
(necessary for older eicon drivers)
echotail=128     ;echo cancel tail setting
devices=2        ;number of concurrent calls on this controller
                 ;(2 makes sense for single BRI, 30 for PRI)