AASTRA 4225 for MX-ONE Telephony Switch - Manual (Page 132)

Troubleshooting
Dialog 4223 Professional/Dialog 4225 Vision 132
Troubleshooting
If your phone is out of order, you can initiate a telephone self-test to
check whether there is a fault in the phone or in the system. You can
also separately check the firmware revision state of your phone.
To initiate a telephone self-test
Dialog 4223 Professional:
PhoneSet
Press (see display).
If
PhoneSet is not shown, press more... until it appears.
Select
Press (see display).
Down
or
Up
Press to frame Local Test Mode (see display).
Select
Press (see display).
The display shows the firmware revision state and
Selftest OK for a
few seconds. If there is something wrong, a fault message appears.
Inform your system administrator about the fault message.
All the key lamps on the phone and connected extra key panels should
be switched on during the self-test to indicate that each key lamp is OK.
After a few seconds the display is checked (the display is completely
dark). The display is OK when there are no light dot(s) or line(s). The
light frame around the display should be there.
Exit
Press the left most display Menu key to exit (see display).
(However the text is not visible when the display has turned black, the
exit feature is still on that Menu key).
Note: If you do not press Exit , the self-test is automatically
finished after about 30 seconds.