asterisk users - Feb 2006 - Broken faxes when other call disconnects

Hello,

I'm setting up a fax transmition using automated dial out 
(http://www.voip-info.org/wiki/index.php?page=Asterisk+auto-dial+out). 
When nobody is talking in the moment of faxing, everything goes ok, fax 
is successfully delivered (even multipaged). But when there is a 
concurrent call on the same outgoing channel (because I'm making calls 
through Cisco router connected to POTS), fax transmition is stopped some 
time after the other call disconnects. Any ideas why is that?

Or maybe do you know a way to do a call (from a .call file) only when 
there are no calls at the moment?

-- 
Best regards,
Bartosz Piec