Connect DECT base to Fanvil IP phone with EHS20 adaptor in order to achieve remote control and allow users to answer and end the calls by press the multi-function button on headset COMPATIBLE HANDSETS Fanvil X2/X2P IP Phone X3S/X3SP/X3G IP Phone X4/X4G IP Phone X5S IP Phone X6 IP Phone FEATURES Hear ring tones Answer calls End calls Mute the microphone COMPATIBLE HEADSETS Jabra only.