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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
but some of the keys and features on your phone function differently. The
keys and most features begin working normally again after you hang up. If
your phone switches to the secondary system while your speaker or handset
is muted (that is, while the MUTE light is on), the call remains muted until
you hang up. Normal operation resumes when your phone switches back to
the primary system. If your phone is idle and switched to the secondary
system, you'll see a flashing rectangle on the display. The rectangle remains
until the switch to the primary system is complete.
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.