asterisk users - Apr 2008 - Receiving 404 Not Found on all outbound calls when attempting SIP trunking between * 1.2.22 and Mitel 3300 CX

We are attempting to configure SIP trunking between asterisk 1.2.22 and a
Mitel 3300 CX box.  The Mitel machine will gateway to the PSTN for us.  I
found this earlier post about doing this from July:

http://lists.digium.com/pipermail/asterisk-users/2007-July/191630.html

Unfortunately the promised configs never came ;(.  We're having the exact
reverse problem: we can register with the Mitel box just fine, and we
receive calls from it correctly.  However all attempts to make outbound
calls from asterisk to the Mitel machine fail with a 404 Not found.

The following is a fragment of our sip.conf (the extensions.conf config is
just a single Dial(SIP/thenumber at mitel-outbound) entry):

register => 450:1234 at 192.168.100.2:5060/450

[mitel-outbound]
 type=peer
 secret=1234
 username=450
 host=192.168.100.2
 fromuser=450
 fromdomain=100.110.0.200
 insecure=very
 nat=no
 context=mitel
 port=5060

In the above: username/password/host are 450, 1234, and
192.168.100.2respectively.  (names changed to protect the innocent).
The box is at
100.110.0.200 (again..)

Has anyone else had a similar problem with receiving 404's on outbound calls
to Mitel boxes?  We found the Mitel doesn't respond at all when we change
the host line above, presumably because the From header in the sip changes
to not include the Username correctly.  I can't get any auth headers to come
in the initial INVITE, although with some digging I found out they would go
out if the Mitel had responded with a 401.

Any help is appreciated.

Robert Bedell
SienaTech
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