Siemens GIGASET SL55 Manual page 98

Handset does not ring.
1. The ringtone is switched off.
Activate the ringtone.
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2. Call diversion set to All Calls.
Switch off call diversion.
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3. MSN is not assigned to internal subscriber or is incorrect.
Specify receive MSN (page 67).
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Handset does not ring after setting up the ISDN number (MSN).
The area prefix has been stored with the MSN.
Store MSN without area code.
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Some of the ISDN functions do not work as specified.
ISDN functions are not enabled.
Check with your network provider.
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The display shows "Not possible!".
Check telephone cable connection between base station and NTBA.
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Call charges are not being displayed.
1. Your network provider does not support this feature.
2. There are no units.
Ask your network provider to transmit the units.
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3. Charge per unit is set to "00.00".
Set the charge per unit (page 49).
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The caller's number is not displayed.
Calling line identification is not enabled.
Caller should ask their network provider to activate calling line identification
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(CLIP).
You hear an error tone (descending tone sequence) when inputting.
Action has failed/invalid input.
Repeat the operation.
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Watch the display and refer to the operating instructions if necessary.
For call diversion, the divert conditions are not displayed.
Internal call diversion is activated.
Activate external call diversion.
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Ask your network provider to enable this feature.
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On a PABX, dialling results in no connection or an incorrect connection.
The access code has not been entered or has been entered incorrectly.
Check and correct the access code (page 79).
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The caller list does not indicate a time for a message.
Date/time are not set.
Set the date/time (page 13).
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Appendix
97