Voil�.
Now i know where is the problem.
I use 2 ISDN channels with a with a fritz! card and the junghanns capi
drivers.
The problem appears with SIP to ISDN calls.
The SIP 180 ringing message doesn't appear because the ISDN PBX sends
the "ALERT" message in-band (channel B), and not in the D channel. So
Asterisk doesn't know when the ISDN channel is ringing.
With my configuration Asterisk can not understand the in-band signalling
for the capi channels, is it possible to use "in-band" signallisation
for capi channels?
Mirko
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