Call routing
175
System functions and features as of R4.1
syd-0570/1.2 – R4.1 – 08.2016
6. 3. 2 CLIP-based routing
It is possible to route incoming external or internal calls based on their CLIP. This way
certain calls can be rejected, left to come to "nothing" or routed to a specific destina-
tion.
There is a blacklist which works only for external incoming calls and can be activated
or deactivated for each trunk group.
Moreover several call routing tables can be defined, which can be assigned for each
switching position of a distribution element. These tables are used both for external
and internal calls via CDE call number.
6. 3. 2. 1 Blacklist
With blacklist, incoming external or internal calls can be rejected based on their CLIP,
left to come to "nothing" or routed to a specific destination. For this enter the CLIP
numbers in a blacklist. Activate the list in one or more trunk groups.
Examples for valid entries in the blacklist.
•+234
• +41321234567
• +4100
• +4101
•+411
•X
•?
Notes:
– All CLIP numbers must start with a '+'.
– “X” stands for incoming calls with call identification restriction (CLIR).
– “?” stands for incoming calls without CLIP (unknown number).
– “X” and “?” are specific entries and cannot be combined with digits.
– The list is sorted automatically after an entry is saved. Short numbers starting with the same
digits are given below.
A call coming in via a trunk group, for which the parameter Use blacklist for incom-
ing calls is activated, is handled as follows:
The CLIP is compared with the entries in the blacklist, starting with the topmost entry. If
the digits of the CLIP starting from the left side matches an entry in the blacklist, the
call is either rejected according to the configuration in the Action selection field, the
caller receives a permanent ring back tone or the call is routed to another destination.
If the CLIP does not match, normal routing is used.
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