Hal,
Cordless phones won't work given the area to be covered. We are installing a 4.9 GHz wireless lan with multiple access points for each facility.

I don't know enough about the Partner system. If I interface to it as an analog phone, how can I pick up any other extension when I don't know which line is active?

I also forgot to mention that the current system has to continue working as it is with the wireless system in parallel.
Jeff