Routes; Numbering - Aastra OpenCom 510 User Manual

PBX Networking

13.3.2 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 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 con-
nection via trunk group "E". PBX 3 switches the connection through, provided
it is appropriately configured (refer to Numbering starting on page 147).
■
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 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.
Note: If an internal connection is switched via a network
operator, the call is signalled using the external number of
the calling PBX.
Configuration
147