Analogue Terminal With No Dial Tone; An Isdn Terminal Cannot Be Called; Isdn Terminal Cannot Conduct External Calls; No Incoming External Calls Possible - TIPTEL 822XT rack Installation Instructions Manual

Analogue terminal with no dial tone

The terminal is probably faulty. Pull out the plug of the terminal and plug it into a
functioning extension. If the terminal does not work for this extension either, contact
your local dealer to replace the device.
If the terminal functions at the new extension, either the analogue connection is faulty
or there is a problem with the wiring. Please contact the company that installed your
telephone system.

An ISDN terminal cannot be called

Pick up the receiver of the terminal. If you hear a special dialling tone, the "call for-
warding" feature is enabled. Deactivate this feature and check it again.
Check whether you have programmed an MSN in the terminal. Consult the User's
Manual of your ISDN terminal for information on querying and programming an MSN.

ISDN terminal cannot conduct external calls

If no external calls are possible (although the relevant authorisations have been as-
signed and the exchange dialling tone can be heard after dialling "0" and the call is
aborted after dialling the next digit), this normally indicates that MSN is incorrectly
programmed in the terminal. Check whether the correct extension number is pro-
grammed for the first MSN. Consult the User's Manual for your ISDN terminal.

No incoming external calls possible

•
If you hear a message that the subscriber's line is temporarily unavailable, check
the connecting cable between telephone system and NTBA and replace it if nec-
essary. If this does not solve the problem, check if your multipoint connection is
functioning properly by doing the following.
•
If the telephone system is connected to a multipoint interface, remove the system
plug from the NTBA and plug the NTBA mains plug into a functioning mains wall
outlet. Take an ISDN terminal and plug it into the NTBA. If you hear a dialling
tone in the receiver of your ISDN terminal, the multipoint interface is functioning
properly and the fault can only be within the telephone system or the wiring be-
tween NTBA and telephone system.
Check the S0 ports of your telephone system. If the S0 interfaces are functioning
properly, it is highly likely that there is a problem with the wiring. Please contact the
company that installed your telephone system.
Troubleshooting
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