Siemens Gigaset 2420 System User Manual page 73

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The corded handset may be defective. Replace tne handset.
There is no audible ringing signal but the status lights behave as ii there is an incoming call.
Verify that the ringer volume is not set to MUTE.
The display is blank.
The power supply may be defective. Replace the power supply.
The telephone will not ring.
The line cord may be defective. Replace the line cord.
There is a problem with one of the two lines. There is dial tone on only one line. Calls are being
received on only one line.
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If you have two lines from the telephone company, verify that both of them are in service.
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The line cord may be defective. Replace the line cord.
Appendix B
106 .Troubleshooting
The Caller ID information does not appear on the display.
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Caller ID is an optional service provided by your telephone company. Make sure that you have subscribed to this service
and that the telephone company has installed it on both of your lines.
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Make sure that the Caller ID feature is enabled and correctly configured on your phone.
Certain telephone numbers cannot be dialed
It is possible that the telephone has been configured so that specific numbers or types of number cannot be dialed. These are
called barred numbers. Verify that you are not attempting to call barred numbers. For information about Cal Barring, see Chapter
7 Customizing Your System.
The display messages on the telephone appear to be presented in a foreign language.
Your telephone system supports display messages in English, Spanish, or French. Verify that the appropriate language has been
selected. For information on how to change the language setting, see Chapter 7 Customizing Your System.
Messages on the Answering System cannot be heard.
If
a headset is plugged in, you cannot listen to messages over the speaker. Either use your headset or lift the handset to hear
messages.