Polycom VVX 601 Series Quick Manual page 35

Tactile "5" key with raised bumps
Large keys
Physical line keys
Physical feature keys
Tactile-discernible number, feature, and
navigation keys
Illuminated feature keys
Microphone mute feature
The "5" key has two bumps that enable you discern
the position of other keys on the keypad.
The large keys on the phone console enable you to access
phone features and functions.
VVX 300 series and 400 series phones have physical line
keys that you can press to answer and end calls.
Many features on the phones are accessible by pressing
feature keys on the phone console.
Keys on the phone console are discernible by their size and
shape.
Many feature keys are illuminated when activated so
you're alerted when a feature is enabled.
The system plays an alert tone when the microphones are
muted or unmuted using any of the Mute keys on the
device or far-end system. The system plays an alert tone
periodically if the device is muted for a set period of time.