System Overview
19
Aastra 470 ab R3.0
syd-0337/1.5 – R3.0 – 05.2013
Virtual and leased-line networking via BRI/PRI interfaces
With this type of With this type of connection the nodes are connected via basic
rate interfaces (BRI) or primary rate interfaces (PRI).
With virtual networking all the nodes are connected via the public ISDN network.
This type of networking is particularly well suited for geographically dispersed lo-
cations which have such a low volume of calls between locations that leased lines
or setting up a private data network are not worthwhile. The range of services avail-
able in a virtual network depends on the range of services offered by the network
provider. The DSS1 ISDN protocol is the main protocol used.
With leased line networking the nodes are connected via dedicated or leased lines.
One advantage of leased line networking are the fixed costs, regardless of the num-
ber of call connections. The most common protocol used is QSIG/PSS1, which sup-
ports several more features than the DSS1 protocol.
Virtual and leased-line networking can also be used in combination. Aastra systems
are well as third-party systems can be used.
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