System Functions and Features as of I7.9
222 Call routing
syd-0200/3.0 – I7.9 – 11.2009
5. 9 Testing overflow routing in the PISN
When a connection is setup the system checks the availability of the selected path.
If it is not available due to overloading or due to a defect, an attempt will be made
to set up the connection via an alternative route, depending on the configuration.
There are two types of overflow routing:
• Overflow routing within the private leased-line network:
Both the initial and the alternative connection path run via dedicated lines of
the private leased-line network.
• Overflow routing via the public network:
The initial connection path runs via dedicated lines of the private leased-line
network while the alternative connection path runs via the public network.
Transmission of the CLIP number depends on the CLIP settings. See also the over-
flow situations illustrated in the example onpage 60.
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