Avaya Headset Adapter for PC headset (16xx and 96xx series) Connects a regular PC multimedia headset with dual 3.5mm audio plugs into Avaya IP phone. Compatible with Avaya 1608 and 1616 9601, 9608, 9610, 9611, 9620, 9630, 9640, 9650 and 9670 (see list below) Allows quickly disconnect headset, if needed to switch between PC or phone. Headset may be shared between PC and phone if an external audio switch used. Warning!!! This product requires a headset with dual audio plugs. Single plug headsets with splitter may not always work.