Polycom IP Phone VVX 411 (12-lines) Office Deluxe Bonus Bundle with Plantronics Headset | Includes EncorePro HW540 with M22 Vista Adapter - Mute/Volume controls
Recommended and Compatible Polycom Headsets For Jive
Compatible Headsets for Polycom VVX IP phones - HeadsetPlus.com Plantronics, Jabra Headset Blog
Polycom VVX250 IP Phone | 2200-48820-019 | £120.00
Headsets to Suit Your Polycom Telephone | Headsets Australia