Mitel 4001 - Manual (Page 5)

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ABOUT YOUR PHONE
The SUPERSET 4001 has six fixed-function keys ( PROGRAM, MESSAGE,
HOLD/RETRIEVE, FLASH, , ) and seven personal keys. A personal key
can be programmed to dial a Speed Call number or a feature access code.
Your telephone also features a large Message Indicator.
Telephone status indicators
TIPS FOR YOUR COMFORT AND SAFETY
Don't cradle the handset!
Prolonged use of the handset can lead to neck, shoulder, or back discomfort,
especially if you cradle the handset between your ear and shoulder. If you
use your phone a lot, you may find it more comfortable to use a headset.
See the section on headset usage elsewhere in this guide for more
information.
Protect your hearing
Your phone has a control for adjusting the volume of the handset receiver or
headset. Because continuous exposure to loud sounds can contribute to
hearing loss, keep the volume at a moderate level.
When line is the indicator is
Idle Off
Busy On
Ringing Flashing
slowly
On hold at your set Flashing rapidly
On hold at another set Flashing slow on/fast off