Bluetooth for my landline

[Miller]

I got a new bluetooth headset for my birthday to go with my cell phone and I really like it (Plantronics 520). It can actually connect to 2 devices at the same time and while I was sitting in my office today I thought it would be really cool if I could just connect it to my office phone as well and be hands-free while I'm in my office. I even noticed that my office phone has a headset jack on it (RJ11). So then I started looking on the web for something that would "convert" an RJ11 port into a bluetooth signal. I completely struck out. There are office solutions, but you have to buy a lifter and the headset together - not what I want. I did find something on Ebay, but it makes me worry. Any one else have any ideas?

http://cgi.ebay.com/Bluetooth-Telephone-Adapter-for-Handsfree-Headset-Store_W0QQitemZ360030714851QQcmdZViewItem

[LoganSix]

I don't use my land-line very much.
However, I did buy stereo bluetooth headset for my cellphone, so I could listen to the music on my phone without wires.  I don't use that much, because it only has about a 4-6 hour battery life and it runs down the cellphone first.