There's a solution...
Look up a box called the xlink. It's a Bluetooth box that takes your cell phone, and converts to rj-11 that you can use with cordless phones, or in my case, a co. Line on the phone system. Now when a call comes on my iPhone, it rings the pbx co. Line and all the extensions ring. I have the 820D-2 version pbx. PM me if you want more info.
Ok...back to original topic lol.