80
PBX Networking PBX Networking
■ One S
0
point-to-point connec-
tion to PBX 3 which is assigned
to the “E” trunk group.
Note: A line or a trunk group can-
not be seized directly. It is always per-
formed indirectly via a route.
Routes
A route is a group of trunk groups
enabling a connection in one direc-
tion. If the first trunk group of a
route is fully utilized, the next trunk
group is seized (“trunk group over-
flow”). One trunk group can also be
used for different routes.
In the above example, a route set up
for PBX 1 allows a connection to
PBX 2. Trunk groups “C,” “E” and “A”
are assigned to this route. If a user
connected to PBX 1 wants to reach a
party in PBX 2, lines will be seized in
the following order:
■ PBX 1 first searches for a free
channel in the “C” trunk group.
■ If all the lines in trunk group “C”
are busy, the system tries to set
up a connection via trunk group
“E”. PBX 3 switches the connec-
tion through, provided it is ap-
propriately configured (refer to
Numbering starting on page 80).
■ If it was not possible to set up an
indirect connection via PBX 3,
the system tries again via trunk
group “A”. The “prefix” neces-
sary for this can be configured
with the route.
■ The user does not get a busy sig-
nal 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 operator, the
call is signalled using the external
number of the calling PBX.
For each route you can define a ran-
domly selectable code digit for seiz-
ing 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 evaluat-
ing 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 number-
ing”, allowing the same telephone
number to be used for reaching each
user within the PBX network.
With closed numbering, the
OpenCom 100 determines which
route to seize from the telephone
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