Numbering - Aastra OpenCom 510 User Manual

PBX Networking
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If all the lines in trunk group "C" are busy, the system tries to set up a con-
nection via trunk group "E". PBX 3 switches the connection through, provided
it is appropriately configured (refer to Numbering starting on page 156).
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If it was not possible to set up an indirect connection via PBX 3, the system tries
again via trunk group "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 con-
nection via the network operator has also failed.
For each route you can define a randomly selectable code digit for seizing the
route. You can also configure whether a user is authorised to seize a particular
route, whether LCR is to be used for one of the trunk groups and the criteria
(business or private call, booking numbers) for evaluating call data.

13.3.3 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 OpenCom 510 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 telephone numbers and/or ranges of telephone numbers to a particular
route.
A default entry in the numbering table makes it possible to seize a "default route"
for all remaining unassigned numbers. In particular, this simplifies configuration of
the OpenCom 510 as a subsidiary system: the only entry you assign to the default
entry is the route to the host system
156
Note: If an internal connection is switched via a network op-
erator, the call is signalled using the external number of the
calling PBX.
Configuration