Routing elements
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System functions and features as of R3.0
syd-0367/1.3 – R3.0 – 03.2013
Network interfaces
Network interfaces provide the access to the communication server from the out-
side. The settings for the network interfaces are used to specify network-specific
characteristics (e.g. point-to-point or point-to-multipoint connection or the distri-
bution of B channel groups at the primary rate access).
As network interfaces are not routing elements per se, they are not discussed fur-
ther in this chapter.
Trunk groups
Network interfaces with the same characteristics are grouped together in a trunk
group. For each trunk group, for example, it is specified whether the grouped net-
work interfaces are connected to a private network or the public network (see
Direct Dialling Plans
Direct dialling is used to reach internal users or PISN users directly from the public
network. The direct dial portion of an incoming call number is used to link the call
with a specific call distribution element (see
).
Routes
All outgoing calls are routed to a trunk group via a route. They also include calls
routed via the Least Cost Routing function and transit calls in a PISN (see
).
Call Distribution Elements
Call distribution elements are used to route a call to a destination or combination
of destinations. The destination (or combination of destinations) can vary depend-
ing on the allocated switch position. If the original destination is busy or does not
answer after a certain time, calls can be routed to alternative destinations (see
Switch Groups
Certain destinations and functions are selected depending on the switching posi-
tion of a switch group. Each switch group has three switch positions, which are
used for example for Day, Night and Weekend (see
