[Asterisk-Users] PRI calls to Automated Attendants Dropped

[Dave Wise]

I have 2 * boxes. 
1 has 2 PRI's from the Telco, and a PRI to the 2nd *
The other has ZAP channels to Channelbanks for endusers.

If someone on the second box calls a Toll Free number (it probably 
doesn't matter that it is toll free) that is auto answered by an auto 
attendant (QVC, a Bank, the Airlines, Credit Card Companies....) then 
the call gets dropped with in a couple of seconds of placing the call 
(the auto attendant barely gets started).  Has anyone ever heard of 
this?  I heard of people not hearing the auto attendant on some systems 
(not asterisk) because the channel isn't cleared or accepted (some sort 
of signaling related to these auto attendants).  (maybe the same 
signaling that shuts off the audio on some PBX's is hanging up the 
*???).  Any ideas/solutions?