Mitel 5001 - Manual (Page 5)

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Telephone Status Indicators
For Users on Resilient 3300 ICP Systems
If during a call, you hear two beeps repeated every 20 seconds it means that
your phone is switching to a secondary 3300 ICP system. The call continues
and there is a change in the operation of some keys and features on your
phone. Normal operation resumes when your phone switches back to the
primary system.
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.
Because continuous exposure to loud sounds can contribute to hearing loss,
keep the volume at a moderate level.
USING YOUR PHONE
Adjusting the ringer volume
To adjust the Ringer Volume while the set is ringing:
z
Press the Volume control button.
Situation: The message waiting indicator is:
Line is idle Off
Line is ringing Flashing rapidly
Message waiting/Voicemail Flashing slowly