[Asterisk-Users] zaphfc sound problems

[Thomas Jagoditsch]

hi list.

after my unsuccessfull experiences with mISDN i tried again to implement 
a zaphfc based solution.
problem is: sound on calls via capi is stuttering/broken and therefore 
unuseable.

my conf:
- cel 1300, 256mb ram
- avm b1 via capi connected to my outgoing ISDN
- acer surf pci via zaphafc and crosslink cable with termination as 
internal bus
- siemens gigaset 3035 as internal phone
- various sip-phones on my pc to test

software versions:
- gentoo with kernel 2.6.9
- bri-stuff.0.1.0-RC4a installed with
    cvs -z9 co -D '2004/08/21 21:34:58' asterisk libpri zaptel

all worked fine and this was the first time i could get the gigaset to 
talk to asterisk (in contrast to mISDN).

but ... the sound problem:
ive got stuttering noises, voice is almost not understandable in some 
cases - but in every case ;-(

symptoms:
- calls form gigaset to asterisk (demo,menu etc) are ok
- calls from gigaset via asterisk to pstn have stuttering
- calls from sip via asterisk to pstn are ok
- calls from pstn to asterisk (demo, menu etc) have stuttering
- calls from pstn via asterisk to gigaset have stuttering
- calls from pstn via asterisk to sip are ok

what me stikes here is that you cant find a definitive suspect here.
zaphfc itself seems to be ok - demo and menu sound are ok and otoh i get 
problems when zaphfc is out of the game - like calling asterisk alone 
from pstn.
but capi itself works - at least when i use sip to call out.
ive got to stop scratching my head about this before i loose to much 
hair ...

i googled around and found no solution. what i tried:
- the hdparm thing
- switching apci/acpi
- changing resitors for termination of the internal bus (100/50 ohms) or 
remove termination completely

one thing that makes me curious are interrupts:

> Sat Nov 20 13:49:30 CET 2004
>            CPU0
>   0:    4270237          XT-PIC  timer
>   1:         44          XT-PIC  i8042
>   2:          0          XT-PIC  cascade
>   5:   32813694          XT-PIC  zaphfc
>   8:          2          XT-PIC  rtc
>  10:      16843          XT-PIC  b1pci-b000
>  11:      16563          XT-PIC  uhci_hcd, uhci_hcd, CMI8738, eth0
>  14:       1822          XT-PIC  ide0
>  15:         17          XT-PIC  ide1
> NMI:          0
> LOC:          0
> ERR:          0
> MIS:          0
> Sat Nov 20 13:49:40 CET 2004
>            CPU0
>   0:    4280248          XT-PIC  timer
>   1:         44          XT-PIC  i8042
>   2:          0          XT-PIC  cascade
>   5:   32893770          XT-PIC  zaphfc
>   8:          2          XT-PIC  rtc
>  10:      16844          XT-PIC  b1pci-b000
>  11:      16569          XT-PIC  uhci_hcd, uhci_hcd, CMI8738, eth0
>  14:       1822          XT-PIC  ide0
>  15:         17          XT-PIC  ide1
> NMI:          0
> LOC:          0
> ERR:          0
> MIS:          0


there was no activity on the system and zaphfc produces interrupts like 
crazy. i found one post describing the same thing - but the thread 
concludes without solution ...

someone got ideas ?

or maybe i could try another approach:
has anyone got a similar working configuration (isdn external & internal 
via capi and/or zaphfc and/or mISDN) ?
which hardware / software do it run on ?

wbr.tja...