B-30
Operator's Manual
T
roubl
eshoot
ing
No dial tone
Possible Cause
Power failure or mains plug not plugged in
Defective connecting box or cable between
telephone and connecting box
System disturbed
Remedy
Check the 230-V supply
Check connecting box or cable between tele-
phone and connecting box
Separate the PBX from the 230-V supply for
about 5 seconds
External dialling or abbreviated dialling
doesn't work
Possible Cause
S
0
ports configured wrongly
System is not connected to the ISDN
NT disturbed
Wrong ISDN protocol
Telephone does not have outgoing access
Direct external telephone is set without hav-
ing first set the dialling mode
Charge account is empty
Remedy
Correct the configuration
Connect the system to the ISDN
Separate the NT from the 230-V supply for
about 5 seconds. If there is still no dial tone,
inform the repair service.
Apply for a DSS1 ISDN protocol
Grant outgoing access from the program-
ming telephone/PC
Set the correct dialling mode from the PC
Increase the charge account from the PC
No external calls
Possible Cause
Call forwarding is activated
No MSN/DDI has been assigned to the tele-
phone
The telephone's ringer is faulty or deacti-
vated
Telephone does not have outgoing access
Call protection is activated
Remedy
Deactivate call forwarding
Assign MSN/DDI (call distribution)
Have the telephone inspected
Grant outgoing access from the program-
ming telephone/PC
Deactivate call protection
Abbreviated dialling doesn't work but
external dialling does
Possible Cause
No abbreviated dialling numbers stored
Access digit
0
was stored in the abbrevi-
ated dialling number
Remedy
Program abbreviated dialling number
Remove the access digit
0
No internal calls
Possible Cause
Extension call forwarding or call protection
activated
The telephone's ringer is faulty or deacti-
vated
Remedy
Deactivate extension call forwarding or call
protection
Have the telephone inspected
No call forwarding from external
Possible Cause
The extension to which the call was redi-
rected does not have outgoing access
Remedy
Grant outgoing access from the program-
ming telephone/PC
Transferring external calls doesn't work
Possible Cause
Extension does not have outgoing access
Telephone's Flash key is not set correctly
Remedy
Grant outgoing access from the program-
ming telephone/PC
Check the Flash key (refer to the tele-
phone's operating instructions) and if neces-
sary set the correct Flash time in the PBX or
carry out automatic Flash time detection
2. 1
Possible Faults