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Telephony
warding user in a chain displayed. The "Via" call number is, however, only dis-
played when the call number display is activated for the forwarding user.
13.2.2 Loop Detection
Loops can generally occur during a call forwarding chain, e. g. when the call for-
warding destination refers back to the call forwarding source. This is why a for-
warded call has a call forwarding history. When the next call forwarding desti-
nation 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.
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242
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
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Note: When call forwarding to the OpenVoice voicebox
programme, the "Via" call number is evaluated in order to
determine the owner of a voicebox. The last call forwarding
user is used no matter what the user group setting. When call
forwarding using the secretarial function of the voicebox
programme, the call number of the voicebox owner is also
shown as the "Via" call number.
X
242
284
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and call signalling is continued.
NEG.
Note: The call forwarding history cannot be transmitted via
Q.SIG connections. Chain detection is also deactivated when
forwarding via the voice portal programme OpenAttendant.
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Call Forwarding
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