So, I went to Richmond today, and noticed that they had phones like these, with proper extensions and everything.
Turns out these things ring really
loud, and the second one is right in a meeting hall. There were more in the building, which I assume also follow the 680x setup. Unfortunately I have no method on how to dial the extensions directly and skip front desk, so use this number sparingly unless you want them getting suspicious.
Number: (804) 783-7450