isdnd does not start a special script (incoming, regprog)

[Johannes Ton]

Hi,

i have configured my isdnd to start a shell-script on incomming calls.
This shell-script calls 1st a perl-script to save the call into a
database and 2nd a jabber-client (a perl-script to) to signal the call
to an other machine.

When i call the shell-script in a shell, a message will be sended by
the jabber-client. But if the client will be started by the
incoming-script (from isdnd), the client terminates with "connection
timed out". There is no problem with the script, no problem with dns,
ipfw or something else that i have found.

While the isdnd tries to start the jabber-client, the hole system freezes for
about 6 seconds.

I've been trying to get this working for about 3 days now... i feel a
headache comming... :)

Any hints?
Thanks in advance
Johannes