Compatiable Headset for Polycom VVX 400 VVX 401 VVX 410 VVX 411 VVX 500 VVX 501 VoiP Light weight, Noise Cancelling mic, Great in any office or home use - EAR308D + QD002P: Amazon.co.uk: Electronics & Photo
Polycom VVX 411 VoIP Phone Headset - EAR308 | eBay
Compatible Headsets for Polycom VVX IP phones - HeadsetPlus.com Plantronics, Jabra Headset Blog
Polycom IP Phone VVX 411 (12-lines) Office Deluxe Bonus Bundle with Plantronics Headset | Includes EncorePro HW540 with M22 Vista Adapter - Mute/Volume controls