asterisk users - Jul 2003 - chan_capi and poor voice quality

Hi,

after getting the chan_capi error messages sorted out, I have another 
question.

Calling * via SIP produces very good sound. Calling * via the chan_capi 
produces horrible sound. However, if I dial 500 in the demo menu to 
connect to the IAX at digium the sound is good again. ie:

ISDNCall->AVM-B1-Card->Asterisk = All prompts sound horrible
SIP->Asterisk = Prompts are good
ISDNCall->AVM-B1-Card->Asterisk->IAX->Digium-Asterisk => Prompts
are good

Any ideas are greatly appreciated.

rgds
pos

PS: Hardware: AVM B1 ISA, latest Debian packages using apt-get via 
sources.list incl. deb http://people.debian.org/~jeff/ woody local
latest capi_chan (0.2.4)

> Calling * via SIP produces very good sound. Calling * via the chan_capi
> produces horrible sound. However, if I dial 500 in the demo menu to
> connect to the IAX at digium the sound is good again. ie:
>
> ISDNCall->AVM-B1-Card->Asterisk = All prompts sound horrible
> SIP->Asterisk = Prompts are good
Stupid question... why don't you use I4L instead of chan_capi? I've
wanted
to use chan_capi myself but due to lack of time haven't been able to get it
running yet. However I4L produces good audio quality, although I miss
extended ISDN features... I'm using AVM Fritz PCI card

Peter