Forgive me if this has been discussed previously, I just haven't seen it

I have a BT HS850 earpiece, and just ordered a Cardo SCALA-500 to replace the HS850 (which flaps too much and feels loose when talking/moving around) for my Treo 650.

Either will work with my Treo 650, however, I wonder if there's a BT base that can be purchased somewhere for use with a land line phone. My goal is to use my BT headset on my mobile, as well as gain use for my office headset.

Ideas? Thanx!