Bluetooth Landline Phone? Anyone Using?

I want to use a Bluetooth headset on my landline cordless phone.

Thought I had bought a cordless phone that would let me do that, but it seems to be more a link2cell system that would let me answer and place calls on my cell phone using it.

I have a cell phone but it is payasyougo and I don't use it much, while I have unlimited calling on my landline service. I just need a cordless headset solution to enjoy it.

Friend is going through a rough time and I want to support her - cordlessly! :confused:

I forsee many long rambling phone calls in my immediate future. HELP!

Thanks