Sound Quality
Issue Possible Cause Solution
The other party
cannot hear my
voice.
The unit is muted.
Press / MUTE/AUTO ANS to turn off the
mute feature.
If you are using the
speakerphone, objects may be
obstructing the microphone.
Do not obstruct the unit's microphone during
calls. Keep your hands, as well as common
objects such as folders, cups, and coffee
pots away from the unit during calls.
Sound cuts out; I can
hear myself through
the speaker.
You are too far away from the
microphone.
Try speaking closer to the microphone.
The environment is not suited to
speakerphone calls.
• Do not use the unit within 2 m (6 ft 7 in) of
projectors, air conditioning devices, fans,
or other audible or electrical noise emitting
devices.
• If using the unit in a room with windows,
close the curtains or blinds to prevent
echoes.
• Use the unit in a quiet environment.
The unit was moved during a
call.
Do not move the unit while on a call.
Objects are obstructing the
microphone.
Do not obstruct the unit during calls. Keep
your hands, as well as common objects such
as folders, cups, and coffee pots away from
the unit during calls.
The other party is using a half-
duplex phone.
If the other party is using a half-duplex
phone, sound may cut out occasionally
during calls. For best performance, the other
party should use a full-duplex phone.
Phonebook List
Issue Possible Cause Solution
I cannot add or edit
entries to the
phonebook list.
The phonebook list is full. Delete any unnecessary entries. The
maximum number of entries in the
phonebook list is 2500.
Bluetooth Headset
Issue Possible Cause Solution
I cannot have a
conversation using
the Bluetooth
headset.
The headset is not registered. Make sure that the headset is properly
registered to the unit.
An EHS headset is connected. Remove the EHS headset from the headset
jack. Priority is given to the EHS headset
when both are connected.
The headset is not charged. Make sure that the headset is properly
charged by following the instructions in the
headset's documentation.
5.5 Troubleshooting
Document Version: 2017-08 Operating Instructions 135
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