Plantronics CS540 Wireless Headset Setup WITHOUT Headset Port
Plantronics CS540 Setup, Installation, and Users Guide
How to eliminate echo from my Plantronics wireless headset when using Toshiba Strata Phones (IP 5000 series - 5131-SDL, 5122-SD, 5132-SD, 5522-SD, 5531-SDL, 5622-SD, 5631-SDL)
Plantronics CS540 Wireless Headset System 84693-01 B&H Photo