Phil,

I have a Radio Shack cordless phone that has a jack for such a 
headset.

the headset, of course, is sold separately. I bought one, and use it 
for conference calls, and for other situations where I need to use the 
computer while on the phone.

I have also seen that feature on a few desk phones, but I haven't 
looked at any of those recently.

I don't know of any house phone that supports bluetooth, but again, I 
haven't looked.