Hooking up A T720 to house telephones

Is anyone aware of a cradle, a patch cord, or device that one could use to plug into your cell phone and have your home telephone system use your cell phone.

I know they exist as I have a magic black box I bought years ago from Cingular that hooks into my car phone and allows me to use my laptop modem. It basically produces a fake dial tone and fools the modem into thinking its a land line.

I have that working in my hangar on a car phone that has been hooked up to a 12VDC power supply and trucker antenna. The magic box is connected in-line with the car phone. I have a regular Radio Shack 6-port RJ11 adapter hooked to the magic box and I have three very normal everyday touch-tone phones hooked up to this magic box. Each phone can receive calls (the damn things even ring) or make calls.

I want to be able to do the same thing with my Motorola T720. Just come one, plug it into a cradle and 'Presto", my girfriend calls my cell phone and I can answer the call on my kitchen or bedroom telephone.

Anybody aware of such a magical device for a T720? How about any other kind of cell phone.

Gadet Man!

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http://www.phonelabs.com
http://www.cellsocket.com
http://www.xcelis.com

You can find dealers and various articles if you search the product names.

Unfortunately, these do not appear to work with most modems, fax machines, satellite boxes, and I think alarm systems (since they use modems). I was really wanting to ditch my land line but I have a fax machine and an alarm system.
Good luck and let me know how they work if you purchase one.
Regards,
ralphkw