[Asterisk-Users] Busy detect on pri channel?

[salmon at netzquadrat.de]

Did anybody figure out how to make dial detect a busy on a zaptel channel on a 
pri interface when using overlap dialing? According to the documentation dial 
should return to priority n+101, if the called party is found to be busy. I can 
see a DISCONNECT message with "user busy" coming from the network when I turn on 
pri debugging, but the dial application does not seem to notice. 

On a related issue: Is there a way of retriving isdn causes for the last call? I 
think it would be very useful for a lot of applications to distinguish in 
between say "network congested", "number unallocated" and a regular hangup. 

Thilo