I stand by my original comment. I think your making things more difficult than they need to be.
Why are you using linear hunting with only 2 phones? Ring all would make more sense to me, then overflow to one of them and re-rout to 433. Simple and it works. If your trying to share the work load tell them to take turns, really, there's only two of them.
The trans.txt is to define how the system handles incoming calls from the CO lines.
Maybe someone else has a better idea for you, that's how I would do it.
mark
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Reliable Telephone Service
