asterisk users - Dec 2005 - Gateway crashes when transferring to external lines

I'm using an Asterisk system with a Zultys MX250 as a media gateway  
for our PSTN. When I configured this originally, I couldn't make or  
receive any outside calls - the MX250 would actually crash and  
restart itself. Very bad. As I was troubleshooting, I found a tip in  
the Asterisk wiki that recommended disabling reinvites for buggy  
gateway. So, I tried that and it fixed the problem.

But now I'm seeing some a similar issue when I receive an outside  
call to an Asterisk extension, then that extension does a manual  
transfer to another outside number. The receiving line will ring, but  
as soon as it is answered the MX250 will crash. Is it possible that  
Asterisk is attempting a reinvite when I do this, or could it be a  
completely unrelated problem? Here's the sip.conf entry that I'm  
using for the MX:
	
[mx250]
context=mx250incoming
type=friend
host=192.168.1.10
dtmfmode=rfc2833
canreinvite=no
disallow=all
allow=ulaw


	- .Dustin Wenz