I admit that I'm not totally understanding where you are going with that, but it may be helpful to know that:
a) The PAP2T has capability for two phones (two phone lines) and two VoIP accounts or subaccounts. How many lines/accounts do you need in total?
b) If the PAP2T is in one building, you could use a special Long Range cordless phone to serve your needs in the other building.
For example:
Long Range Cordless Phone Features:
Coverage of Up to:
25,000 square feet
10 acres
6 floors of penetration
Superior Multi Floor Coverage
Penetrates Concrete, Wood, and Drywall
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