Call routing
251
System functions and features as of R4.1
syd-0570/1.2 – R4.1 – 08.2016
6. 9 Break-Out
An outgoing, external call is to be routed into the public ISDN only at the PINX that is
closest to the call destination. If the source PINX and gateway PINX are a long way
apart and connected with each other via dedicated lines, break-out can help to achieve
considerable call charge savings.
For the caller always to be available under the same number regardless of the path via
which his calls are routed to the public network, the called party must always be pre-
sented with a CLIP with that same number.
If the call is transmitted to the public network via a gateway PINX, the CLIP number will
be outside the registered number range. If the network operator is to forward the CLIP
number, the service "Special Arrangement" will have to be utilized subject to its availa-
bility from the network operator (see also page 74
).
Fig. 125 Break-out
Configuration example
The PINXs of a company with branch offices in Zurich and Geneva respectively are
connected with each other via a dedicated line. Outgoing calls made from Geneva to
the local rate zone in Zurich are always to be routed into the public network at Zurich.
Incoming calls for the branch office in Geneva are always to be routed from the public
network to PINX 1 in Geneva.
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