AASTRA 4420 IP Basic (SIP) for MX-ONE User Guide - Manual (Page 68)

Troubleshooting
Dialog 4420 IP Basic 68
Troubleshooting
This section contains information on how to solve common
operational problems, and warnings you may receive.
Go through the following list if you encounter any problems. If this
checklist does not cover the problem, contact your system
administrator. If others have similar problems, there may be a
system error.
Fault Probable cause Action or
comment
The phone is
locked
Disturbance on the
network.
Press the Clear
key, Mute key and #
simultaneously
for one or two
seconds. This will
restart the phone.
The Status lamp is
extinguished.
There is no power. Verify that the
phone has power
support.
The Status lamp is
double flashing.
There is no
connection to the
network.
Verify that the
phone is
connected to the
network by
checking the
connection.
The Status lamp is
flashing slowly.
The phone is not
registered or you
are not logged on.
Contact your
system
administrator for
assistance.