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116 APPENDIX A: TELEPHONE INSTALLATION AND MAINTENANCE
Cleaning Your
Telephone
Always unplug your telephone from the power source and from the
network before you clean it. Use a soft cloth dampened with mild
detergent.
WARNING: Failure to unplug the telephone before you clean it could
result in electrical shock.
Troubleshooting
Problems
Table 16 lists possible problems that you may encounter and the most
likely solutions. Where possible, each solution refers to the section in this
guide where you can find detailed information.
Table 16 Possible Problems
Possible Problem Suggested Solutions
My telephone has no dial
tone and the display panel
is blank.
■ Verify that the power cord is fully inserted in the
correct connector on the underside of the
telephone. Use the strain relief tab to prevent the
cord from becoming unplugged.
■ Verify that the Ethernet cables are connected and
that each cable is in the proper connection.
■ Remove and add power to the telephone by
unplugging the power cord at the electric outlet
and plugging it back in.
■ If the telephone is powered through a powered
Ethernet cable, make sure that power is applied to
the cable at its source.
My telephone has “locked
up.”
■ Your telephone has lost the connection to the
system. Remove the Ethernet cord from the jack,
and then re-insert it into the jack.
■ Wait a few seconds. If the telephone display panel
still appears to be locked, disconnect the electrical
power for your telephone, and then plug it back in.
Callers cannot leave
messages on my voice mail.
■ Your mailbox may be full. Log in to your voice
mailbox and delete some messages.
■ Your telephone may be set up for Greeting Only
Mailbox. Log in to NBX NetSet > NBX
Messaging and clear the Greeting Only Mailbox
checkbox.
When I park a call, the
display panel shows “Park
xtn in use,” and the call
returns to my telephone.
You have selected a Call Park extension that is already
in use. Try another Call Park extension. Your
administrator can add additional Call Park Extensions.
For details, see “Call Park”
in Chapter 9.