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Amazon.com: Avaya Compatible Plantronics CS540 VoIP Wireless Headset Bundle with Electronic Remote Answer|End and Ring alert (EHS) for Avaya Phones: 1600, 9600 IP Phones: 1608, 1616, 9601, 9608, 9610, 9611, 9611G, 9620, 9620C, 9620L, 9621, 9630, 9640 ...
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Amazon.com: Plantronics - CS540 Wireless DECT Headset (Poly) - Single Ear (Mono) Convertible (3 wearing styles) - Connects to Desk Phone - Noise Canceling Microphone : Everything Else
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Cisco compatible Plantronics CS 540 -Wireless Headset (convertible), # 84693-01, CS540, wireless, 520, DECT, plantronics wireless CS540 headset | Use with Cisco 7900 series
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