Is there a Bluetooth adapter for desk phones?

[Secshunate]

Is there a Bluetooth adapter for desk phones?
I have an IP desk phone at my work and I would like to use my existing bluetooth earpiece (the Plantronics one I use with my Iphone) with my desk phone as well. My desk phone has a 4-pin phone jack for connecting a headset. Are the no adapters that do this?

I know they sell all sorts of expensive kits from DECT & Bluetooth for this but they all come with earpieces and I already have one that I like. I don't want to buy another.

 

[Bill James]

You can hook up your iPhone to an adapter that is connected to your work phone. When a call comes through your work phone, your iPhone will display the caller id and you can listen through your Bluetooth headset connected to your iPhone.

Siemens Gigaset Bluetooth Gateway allows upto 3 Mobile phones connected.

http://how-to-fix-earbuds.blogspot.com/2012/01/how-to-connect-two-bluetooth-headphones.html