Nope, I even opened a paid support ticket with Schmooze to look into the issue. Using IAX allowed the call to pass, but it would then show the local info of the local PBX which would confuse people, but at least the call processed.
The end of it was basically that you can use the same extension number on the two PBX’s, and have an interoffice trunk, and if you don’t designate at interoffice, then it will just show the defined default outside number.