Uniden XDECT 7015, Руководство пользователя

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Weak or Hard To Hear audio
If a caller’s voice sounds weak or soft, the signal might be blocked by
large metal objects or walls; you might also be too far from the base,
or the handset’s battery may be weak.
Try moving around while you’re on a call or moving closer to the 
base to see if the sound gets louder.
Make sure the handset’s battery is fully charged.

Try adjusting the earpiece volume or the audio tone (see below1.
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Adjust the audio tone
During a call, open the menu and select Audio Tone . Choose one of
the three audio tone options: High Tone , Natural Tone (recommended
for hearing aid users1, or Low Tone . You may have to experiment to
figure out which audio tone works best for you.
Noise or Static On The Line
Interference is the most common
cause of noise or static on a cordless
phone. Here are some common
sources of interference:
electrical appliances, especially 
microwave ovens
computer equipment, especially

wireless LAN equipment and DSL
modems
radio-based wireless devices,

such as room monitors,
wireless controllers, or wireless
headphones or speakers
large florescent light fixtures

(especially if they give off a
buzzing noise1
other services that use your phone line, like alarm systems,

intercom systems, or broadband Internet service
Do you use a T-Coil hearing aid?
If you have a hearing aid
equipped with a telecoil (T-coil)
feature, the interaction between
the hearing aid & digital cordless
phones can cause noise in the
handset. If you have a T-coil
hearing aid & you have problems
with noise on the line, try turning
on T-coil mode. Open the menu.
Select Handset Setup, then
select T-coil.
Using T-coil mode can shorten
the handset’s talk time; make
sure to watch the battery status
and keep the battery charged.