Is there a Bluetooth adapter for desk phones?

Secshunate

Reputable
Mar 7, 2014
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4,510
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.