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Once you hear the busy signal, dial 159
within one minute. |
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You cannot register for this service when
the number you are trying to call is an INS-Net number, mobile phone number or
numbers with a large volume of calls. |
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This service may not be available in some
regions. |
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If the number is still busy after 45 minutes,
you will only be notified once. (In this case, charges will still apply.) |
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When the number you want to
call is the number for the main line, you will be notified when one of the additional
extension numbers becomes free. |
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If you do not answer the notification call,
the phone will ring 3 times at five-minute intervals. |