Avaya Telephone Compatible Headset Plantronics HW251N Bundle w/Mute - Avaya IP Phones: 1608, 1616, 9601, 9608, 9610, 9611, 9611G, 9620, 9620C, 9620L, 9621, 9630, 9640, 9640G, 9641, 9650, 9650C, 9670 BUNDLE OF 2 ITEMS: Plantronics HW251N Headset and Avaya compatible telephone Interface cable with Mute button COMPATIBLE WITH SELECT AVAYA PHONES: 1600, 9600 and Jseries IP Phones: 1608, 1616, 9601, 9608, 9610, 9611, 9611G, 9620, 9620C, 9620L, 9621, 9630, 9640, 9640G, 9641, 9650, 9650C, 9670, J139, J169, J179 UPDATE CABLE CONSTRUCTION: Quick Disconnect and Mute Button - Allows for easy disconnect from phone without removing headset and "mute" a conversation right from the headset. No need to reach for your phone's mute button. PLANTRONICS SOUND QUALITY: Premium Plantronics Wideband Audio, Ultra Noise-Canceling microphone filters out background sound UPDATED WITH MUTE BUTTON: Now you can mute your calls! Lighter cord with quick disconnect and in-line MUTE button. You can't do that with the older HIS-1 adapter cable. Compatible with Plantronics Headsets, VXi- P version Headsets and AddaSound Headsets