Know any landline cordless phones that can hook up to a bluetooth headset?

I am opening up a nail salon. The receptionist needs to be able to walk around & make appointments without holding the phone in her hand.

Anyone know any cordless phones that can connect to a bluetooth headset?
If so, can I just buy any bluetooth headset to go along?
How far can I walk away without losing signal?

I'm not looking into hooking up any cellular phones. All answers are appreciated.