Touch Tone Tommy had the solution that meets all of the needs posted.
The 406 is a good match or there is the Small Office Edition depending on how many phones are needed. There is a discontinued version out there with 4 Analog CO and 8 Analog Phone ext's with 3 VCM's for VOIP phones.
Just a matter of programming the system to dial as needed. The dialtone on the IPO sounds like regular CO dialtone. With just a couple of shortcodes, you can dial anyway you want.
In our office our system is setup for dialing out directly without additional digits. If we want to make an internal call, we just dial the extension. The system knows what to do......
