In this book we summarize important developments in
telecommunications with a focus on Signalling System No. 7 (SS 7)
network reliability. But why is SS 7 network security and
reliability so important? According to the Open Systems
Interconnection (OSI) model the term "network" refers to the Layer
3 network service, which is offered by the Message Transfer Part
(MTP) and Signalling Connection Control Part (SCCP) to higher
layers. An SS 7 network outage results in a breakdown of signalling
between the individual nodes of the network, so that
telecommunication network services are no longer available to
customers. Apart from the tremendous nancial damage to the network
operator, the social consequences of such a network breakdown
cannot be underestimated. Since the MTP is the central part of the
SS 7 network, it is of crucial importance for network security and
reliability. The MTP is published in different versions and should
now be what we call "stable." Is it really stable? Does it work
properly in real networks? Does it t new requirements so that no
further changes within the MTP are needed? Various different
implementations have existed for a long time and are used in
national as well as the international network. Due to this, an
objective is not to p- form any further changes within the MTP in
order to avoid compatibility problems with existing and running
systems. Experience shows that compatibility problems are always
related to further development of the MTP.
General
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