User guide

Call Forwarding 169
Tele phon y
Number Handling with E.164 and Lists – Black List, White
List, etc.
The combination of E.164 numbering scheme and black-, white,
special lists requires explicit duplex/triplex handling of numbers in
all eventually possible formats.
Example: 0-6104-1234, 0-030-6104-1234, 0-0049 30-6104-
1234.
All these possible formats can be dialled and so work around the
e.g. black list. That has to be considered in programming these
features.
Call Forwarding
The current version of the Forum 523/524 communications sys-
tem also offers configuration of multi-level call forwarding. When
you forward a call number that has already been forwarded, this
results in a call forwarding chain.
Call Forwarding Chain
Multiple call forwarding is executed independent of the call for-
warding type. An overview of the various call forwarding possibili-
ties is nonetheless helpful for the following explanations.
Call Forwarding
Name Description
Call forwarding
immediately (CFU)
Immediate and unconditional call
forwarding
Call forwarding on busy
(CFB)
Call is forwarded only if user is busy
Call forwarding after
time (CFNR)
Call forwarding is only executed after
a definable time interval
Call Diversion (CD) Is manually executed upon an
incoming call from the user
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CFU CFB
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