Avaya Headset Adapter: Connect a PC Headset to Avaya Phone Converts a regular PC headset with dual 3.5mm plugs into RJ-9 modular plug for Avaya Business Phone Compatible with most Avaya phone models except 16xx and 96xx-series (see our other product for Avaya 9600-series phones) Allows quickly disconnect headset, if needed. With an external audio switch, headset may be shared between PC and phone. Warning!!! This product requires a headset with dual audio plugs. Single plug headsets with splitter may not always work.