Making and Receiving CallsIssue Possible Cause & Solution ReferenceI cannot make calls. • Your phone system/service has disabled service for your unit.→ On the Information Display screen (Page 40), if "Notregistered" is displayed for the lines registered to yourphone, consult your administrator or dealer.—• The phone number was entered incorrectly.→ Confirm that you have entered the phone number of theother party correctly.→ Consult your administrator or dealer.Page 21• The unit is downloading a firmware update.→ You cannot make calls while the unit is downloadingupdates. Wait for the update to finish, and then try makinga call.—• The phonebook list is being imported or exported.→ Wait a few minutes for the operation to complete.→ Confirm with your administrator or dealer.—I cannot make longdistance calls.• Your telephone service does not allow you to make longdistance calls.→ Make sure that you have subscribed to your telephonecompany’s long distance service.—The unit does not ringwhen a call is received.• The ringer volume is turned off.→ Press [+] on the VOLUME key. Page 20While talking to an outsideparty, the line isdisconnected.• Your phone system/service may impose a time limit on outsidecalls.→ Consult your dealer to extend the time limit, if necessary.—Sound QualityIssue Possible Cause & Solution ReferenceThe other party cannothear my voice.• The unit is muted.→ Press [MUTE] to turn off the mute feature. Page 27• If you are using the speakerphone, objects may be obstructingthe microphone.→ Do not obstruct the unit's microphone during calls. Keepyour hands, as well as common objects such as folders,cups, and coffee pots away from the unit during calls.—Document Version 2014-04 Operating Instructions 89Appendix