Issue Possible Cause & Solution Reference
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 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 speakerphone.
→If the other party is using a half-duplex speakerphone,
sound may cut out occasionally during calls. For best
performance, the other party should use a full-duplex
speakerphone.
—

Phonebook List

Issue Possible Cause & Solution Reference
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 500 for the KX-UT123/
KX-UT133/KX-UT136 and 100 for the KX-UT113.
Page 35
Error Messages
During operation, error messages might appear on the unit. The following table lists these messages and
possible causes and solutions.
Message Possible Causes & Solutions Reference
IP address collision •The unit’s network settings are incorrect.
→Consult your system administrator or dealer. —
Illegal IP address
Invalid IP address
Check LAN cable. •The LAN cable is not connected.
→Check all connections. Page 59
Document Version 2011-06 Operating Instructions 75
Appendix