asterisk users - Jan 2006 - bristuff/zaphfc disturbing other ISDN phones

I have ISDN BRI line (Point-to-multipoint), with HFC card and
bristuff/zaphfc driver.

I also have TA attached to NT, with analog phones and modem on it.

When I'm dialling through Asterisk/bristuff, and in the same time TA
have some conversation (or maybe modem link) on channel 1, I can hear
that conversation (or modem) very short period (0.2sec), and I also
disturbing that conversation (modem).

On CLI is shown:
-- Called g1/454325454
-- Moving call from channel 1 to channel 2

But this short "moving" call from busy channel 1 to free channel 2 is
enough to break my modem link which operating on channel 1.

Interesting, if I call exactly through channel 1 "dial(ZAP/1/...)"
I'm
also getting "Moving call from channel 1 to channel 2". It's no
help to
use "chanisavail(ZAP/1)" because same thing happening: channel is
marked
as available, but then disturbing existing conversation on channel 1 and
then moving from 1 to 2. If channel 1 is occupied with Asterisk
(bristuff) conversation, then this problem don't exist (no disturbing).

Hi!
> When I'm dialling through Asterisk/bristuff, and in the same time TA
> have some conversation (or maybe modem link) on channel 1, I can hear
> that conversation (or modem) very short period (0.2sec), and I also
> disturbing that conversation (modem).
I've made a somewhat similar experience: One of our clients was operating 
a small ISDN PBX on the same NTBA (ISDN bus) as the HFC-S card and had a 
little ISDN watch tool (connected via USB to the small ISDN PBX) in the 
Windows tray to keep him informed of channels going up and down etc. 
After about 10 sec bristuff calls were suddenly badly distorted.

The "fix" was to let Asterisk own that specific ISDN bus alone.

Philipp