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Troubleshooting
110
Using the following table try to define the cause of a problem and resolve the error.
Troubleshooting
The telephone can be reset by pressing the “Microphone mute” + number key 5
and the 3
rd
selection key from the top at the same time (re-start).
Problem Possible cause Remedy/
Recommendation
No display No connection with the
ISDN line
Check all cables and
plugs. Test other
telephone sockets.
Display too weak or dark Contrast set incorrectly Set contrast
No sound Volume set to zero Adjust volume
Noise or other
interference in speakers
Interference from wireless
telephone, monitor etc.
Change installation
location
Incorrect or no connection
when dialling from
telephone system
Exchange access code
has not been entered
Enter exchange access
code
Call forwarding cannot be
activated.
Call forwarding settings
are missing or incorrect.
Network operator or
telephone system does
not support the function
or function is not
authorised.
Verify or test and modify
configuration. Ask your
network operator, whether
or not the function is
possible or has to be
switched on.
No call number displayed
when a call is received.
Your network operator
does not support the
function or the function is
not switched on.
The caller has suppressed
the sending of the
number.
Ask your network
operator, whether or not
the function is possible or
has to be switched on.
110


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