Jabra LINK 260 USB Adapter is compatible with any Jabra corded headsets and all leading softphone VoIP applications. The adapter is plug-and-play with PC’s running Windows. Jabra Link 260 incorporates Digital Signal Processing (DSP) for clear sound quality and noise filtration for clear and distortion-free audio. In addition it features in-line buttons let you control the any feature of your softphone with the press of a button.  You can answer/end calls, put calls on hold, adjust volume, and mute with the press of a button.  These buttons can also be programmed by the computer for a pre-defined function.  

NOTE: Jabra/GN Netcom Headset sold separately

For more details see Jabra Link 260 datasheet