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

[Armin Schindler]

On Thu, 29 Jun 2006, Benjamin Sebbah wrote:
> ----- Original Message -----
> From: Armin Schindler <armin at melware.de>
> Date: Thursday, June 29, 2006 11:48 am
> Subject: Re: [Asterisk-Users] Very bad quality with AVM Fritz!card PCI
> and chan_capi
> 
> > 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 for the answer, I did try to disable equosquelch but it doesn't
> change anything (by the way it is disabled right now). To see if the
> noise was a gain issue I tried to modify rx/txgain to see if it changed
> anything but it didn't so I let those two values at 0.5
> 
> Any other idea?

Maybe the card/driver has a problem. IRQ issue?

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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