T-Home Comfort Pro S, Руководство по установке

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118
PBX Networking Configuration
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Two S
0
point-to-point connections to PBX 2 which are assigned to the “C” trunk group.
■
One S
0
point-to-point connection to PBX 3 which is assigned to the “E” trunk group.
N
Note: A line or a trunk group cannot be seized directly. It is always performed indirectly
via a route.
Routes
A route is a group of trunk groups enabling a connection in one direction. If the first trunk group of a route is
fully utilized, the next trunk group is seized (“trunk group overflow”). One trunk group can also be used for dif-
ferent 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:
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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 connection through, provided it is appropriately configured (refer to Numbering
starting on page 119).
■
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.
■
The user does not get a busy signal until the attempt to set up an indirect connection via the network
operator has also failed.
N
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 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.