Review on RJ9 Telephone Headset for Call Centers on Landlines with Noise Cancelling Mic | Compatible with Yealink, Grandstream, Snom, Panasonic | Includes Additional 3.5mm Connector for Mobile Devices by Claudia Green

I used a Blue Parrott Bluetooth headset with a Polycom VVX 600. The phone and my VOIP provider supported/supported HD voice, but my Bluetooth headset did not. I kept getting complaints that my Bluetooth headset sounded weak or "tinny," so I decided to switch back to a wired headset. I paid €46.99 for this device and so far I am very satisfied. When I first connected the headset to my Polycom phone, the headset did not work properly. But I added the included RJ-PA adapter and my headset worked like clockwork. I would buy this headset again.