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)
Amazon.com: USB-A to QD Adapter Cable Compatible with Any Plantronics or TruVoice Wired Headset with a QD and Includes Volume Control and Mute Functionality (Connects Headset to PC, Laptop and Softphones) :
Cisco compatible Plantronics CS 540 -Wireless Headset (convertible), # 84693-01, CS540, wireless, 520, DECT, plantronics wireless CS540 headset | Use with Cisco 7900 series
Plantronics CS540 Headband Wireless Headset - Black | eBay