Adapter cable with dual 3.5mm PC Headset jack to RJ9 Desk Phones Jack for Avaya, Cisco Adapter cable with dual 3.5mm PC Headset jack to RJ9 Desk Phones Jack for Avaya, Cisco Convert two 3.5mm plugs to single 4P4C RJ9/RJ10 headset plug Works with mono and stereo PC headsets Compatible phone Avaya 1600 and 9600 series Avaya 1608, 1616, 9620, 9630, 9640, 9640G, 9650, 9670 IP Phones Cisco 7902, 7905, 7905G, 7906G, 7910, 7911, 7912, 7932G IP Phones