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

[Armin Schindler]

On Thu, 29 Jun 2006, Benjamin Sebbah wrote:
> 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.

echotail is for hardare-echo-cancel only (e.g. Eicon Diva Server) and does 
not change anything for AVM card.
Did you try to disable echosquelch?

Why did you set rx/txgain to 0.5 ? Most people use 0.8, but I use 
no gain by setting it to 1.0, which works here good.

Armin
 
> 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)
> 
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