Issue Possible Cause & Solution ReferenceSound cuts out; I can hearmyself through thespeaker.• 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 conditioningdevices, fans, or other audible or electrical noise emittingdevices.→ If using the unit in a room with windows, close the curtainsor 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, aswell as common objects such as folders, cups, and coffeepots 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 bestperformance, the other party should use a full-duplexspeakerphone.—Phonebook ListIssue Possible Cause & Solution ReferenceI cannot add or edit entriesto the phonebook list.• The phonebook list is full.→ Delete any unnecessary entries. The maximum number ofentries in the phonebook list is 500 for the KX-UT123/KX-UT133/KX-UT136 and 100 for the KX-UT113.Page 35Error MessagesDuring operation, error messages might appear on the unit. The following table lists these messages andpossible causes and solutions.Message Possible Causes & Solutions ReferenceIP address collision • The unit’s network settings are incorrect.→ Consult your system administrator or dealer. —Illegal IP addressInvalid IP addressCheck LAN cable. • The LAN cable is not connected.→ Check all connections. Page 59Document Version 2011-06 Operating Instructions 75Appendix