This cable will allow you to connect Plantronics, Jabra and VXI devices including wireless headsets and amplifiers.  A short list of devices is below.

Plantronics Devices:

• M22 Vista and MX15 amp
• Savi Wireless 700 series headsets
• Plantronics CS500 series
• Legend Voyager CS
• CS50/55 Wireless

VXI Devices:

• Everon Amp
• V100 Wireless Headset
• V150 Wireless Headset

Jabra Devices:

• Link 850, Link 180 and GN8210 amp
• Jabra PR0 920/925
• Jabra PRO 9400 Series
• Jabra Motion Office UC
• Jabra 6470 Wireless

Example of Compatible phones:

• Linksys Cisco SPA phones with a 2.5mm headset jack
• 303G, 501G, 502G, 504G, 508G, 509G, 512G, 514G, 525G2
• Other models: 921, 922, 941, 942, 962
• Comdial EDGE phones with a 2.5mm headset jack
• Vertical phones with a headset port on the side of phone
• Polycom SoundPoint IP models 320/330
• Panasonic Consumer phones