Operation Manual

102
Appendix
7G_8G_HS_an_ ISDN-Basen / en / A31008-M1751-X101-2-7619 / appendix.fm / 29.10.2007
Handset does not ring.
1. The ringtone is switched off.
◆ Activate the ringtone.
2. Call diversion set to All Calls.
◆ Switch off call diversion.
3. MSN is not assigned to internal subscriber or is incorrect.
◆ Specify receive MSN (page 72).
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.
Some of the ISDN functions do not work as specified.
ISDN functions are not enabled.
◆ Check with your network provider.
The display shows "Not possible!".
◆ Check telephone cable connection between base station and NTBA.
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.
3. Charge per unit is set to "00.00".
◆ Set the charge per unit (page 53).
The caller's number is not displayed.
Calling line identification is not enabled.
◆ Caller should ask their network provider to activate calling line identification
(CLIP).
You hear an error tone (descending tone sequence) when inputting.
Action has failed/invalid input.
◆ Repeat the operation.
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.
◆ Ask your network provider to enable this feature.
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 84).
The caller list does not indicate a time for a message.
Date/time are not set.
◆ Set the date/time (page 16).