BELGACOM Forum 523, Руководство по монтажу и пусконаладке, Страница: 164 / 244

Configuration 162
PBX Networking
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PBX 1 first searches for a free channel in the “C” bundle.
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If all the lines in bundle “C” are busy, the system tries to set
up a connection via bundle “E”. PBX 3 switches the connection
through, provided it is appropriately configured (refer to
Numbering starting on page 162).
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If it was not possible to set up an indirect connection via
PBX 3, the system tries again via bundle “A”. The “prefix”
necessary for this can be configured with the route.
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The user does not get a busy signal until the attempt to set up
an indirect connection via the network operator has also failed.
Note: If an internal connection is switched via a network opera-
tor, the call is signalled using the external number of the calling
PBX.
For each route you can define a randomly selectable code digit for
seizing the route. You can also configure whether a user is author-
ised to seize a particular route, whether LCR is to be used for one
of the bundle and the criteria (business or private call, booking
numbers) for evaluating call data.
Numbering
A user can seize a particular route by pre-dialling a specific code
digit. With this “open numbering”, a user must always dial this
code digit and then the telephone number in order to reach a
party in another PBX.
If none of the telephone numbers in your PBX network occur
twice, you can also configure “closed numbering”, allowing the
same telephone number to be used for reaching each user within
the PBX network.
With closed numbering, the Forum 523/524 determines which
route to seize from the telephone number dialled. The information
needed for routing a call can be configured in a numbering table
containing up to 100 entries. You use this table to assign tele-
phone numbers and/or ranges of telephone numbers to a particu-
lar route.
A default entry in the numbering table makes it possible to seize
a “default route” for all remaining unassigned numbers. In partic-