I own a small private security services business. Some of my clients require 2-10 security officers per location. I'm trying to think outside the box in order to solve my communications problem. I'd rather not buy or lease hf radios or voip systems at the current rates. I'm wondering if there is an existing system, or if is at all possible, to setup a private communications network using only a server and bluetooth devices or a wifi/bluethooth combination.

http://25.media.tumblr.com/tumblr_m44f0pn7BL1rwp6tgo1_1280.png

I don't need "radio" per se. I just need a simple, private voip network. Is there an existing device that consists of nothing more than a wifi adapter to control a bluetooth device?