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Call Forwarding
Telephony
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Loop Detection
Loops can generally occur during a call forwarding chain, e. g. when the call
forwarding destination refers back to the call forwarding source. This is why a
forwarded call has a call forwarding history. When the next call forwarding
destination is already included in the call forwarding history, a loop is detected
and any further call forwarding is prevented. If no parallel call signalling takes
place, e. g. by the
Indicate call forwarding after time parallel
setting in the
user group, the call is cleared when there is a loop.
Loop Detection
A loop is also detected during call diversion. When you wish to divert an
incoming call to a destination call number which is already part of the call
forwarding chain, the display shows
NEG.
and call signalling is continued.
Note:
The call forwarding history cannot be transmitted via Q.SIG
connections. Chain detection is also deactivated when
forwarding via the voice portal programme
Forum Auto Attendant.
Virtual Call Numbers
A virtual call number is not assigned to any terminal. You always also enter an
internal or an external destination call number directly when configuring a
virtual call number. When the virtual call number is called this destination call
number is signalled. This behaviour is handled as an immediate call
forwarding and is thus the first call forwarding in a possible call forwarding
chain.
You can include a virtual call number e. g. in call distribution. Using the possi-
bility of multiple call forwarding, you can also use a virtual call number as an
exchange (“Operator”). Furthermore, a user with the
Call forwarding for
other user
authorisation can configure additional call forwarding for a virtual
call number also.
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