Two phone units included enable even distribution of microphones and loudspeakers
Centralized access to dialing, mute and volume controls
Distributed echo cancellation
Noise cancellation
Advanced microphone activation processes
Easy setup - just plug it in and talk
Automatic level control adjusts microphone volume levels based on how loudly participants in the local room are talking to improve voice quality for far-end participants
Automatic gain control adjusts loudspeaker volume based on the incoming audio signal from the far end to provide clear, intelligible audio in the local room
OFFICE PHONES 
VoIP PRODUCTS 
When 2 or 3 handsets is enough...