[richardwillyams]

Offering precision communication for both traditional and VoIP phones, the Plantronics Vista M22 amplifier is ideal for professionals requiring consistent, comfortable listening levels and hands-free office productivity. The M22 is compatible with most phones and includes Clearline™ audio to heighten clarity, especially in a wideband VoIP environment.
http://www.ultimateheadsets.com/

[richardwillyams]

Platronics Vista M22 :
Highlights :
* Offers superior voice clarity with Clearline™ audio technology.
* Delivers optimized audio levels for superior listening comfort – whatever the call.
* Echo management for clearer calls.
* Protection from loud noises.
* Reduces background noise for clearer calls.
* Volume, headset/handset and mute controls.
* Adjustable incoming and outgoing volume.
http://www.ultimateheadsets.com/