OpenPhone 27 Handset User Guide
•Range Warning: provides 4 short beeps whenever you move out of range of the system. When you are out of range of the system, your OpenPhone 27 handset will not function. If you hear the 4 short beeps, move back into range by getting closer to a Radio Fixed Part (RFP).
•Volume Setting: sets the volume of the handset earpiece, loudspeaker, and headset during the call. You can only set the volume while on a call. To set the volume (7 levels), long press
the up or down arrow keys 
.
•Time: displays the 3300 ICP system time.
•Contrast: adjust the contrast of the handset display.
•Languages: changes the display language. A maximum of 8 languages are supported: Dutch, German, Italian, English (default is English), French, Spanish, Swedish, Finnish.
•Headset: supports a standard 2.5 mm jack to connect a headset (inline hook switch supported).
Contacting emergency services.
This handset, like any wireless phone, communicates over radio signals. As with any wireless phone, you may not be able to establish a connection under all conditions. Therefore, you should never rely solely on a wireless telephone for essential communication (for example, in medical emergencies).You can program an emergency number into the SOS key on your handset (see Using the SOS key on page 21).
The Key Lock feature disables the handset keypad and prevents the accidental dialing of numbers that could result in nuisance calls. It also prevents accidental calls to emergency services numbers (for example 999, 911 or 112).
To enable or disable the key lock while in idle state:
•To enable long press the # key, to disable press the 
softkey and then press #.
Currently, mobile IP phones do not fully support Enhanced 911 (E911) operation. It is necessary to keep the system administrator and the location database current when the phone is moved, if emergency services are required.
Important note for headset users
You can plug the optional headset into the jack on the OP27 handset and enable the
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
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.
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