Has anybody here ever worked with these people or the Protel PBX? They have approached us about being dealers, and talk about features, but I have yet to lay eyes on an actual manual of any type. They did let me log into a test system remotely, but it seems to be a bit lite on features...though I'm told that because the phones are smart devices, they handle a lot of the work load. I'm looking at Grandstream or Yealink phones to go with this system, though they will support Cisco as well. Any thoughts or input?

Is Protel the old payphone company?

I don't think so...company seems to be nexMatrix, and the product name is Protel. They have this PBX, they are a SIP provider and they have a CRM package called Atlantis.