Yet SS7 and the
IN concept failed on a number of fronts in my mind. There was so much emphasis on
the ???killer application??? that would somehow justify the expense of implementing such
an infrastructure, that the entire industry simply set itself up for disappointment.
The concept itself was a great idea and is certainly still worth pursuing in today??™s modern
networks. You will see constant themes of the IN throughout this book as we discuss
the various functions and features of the IMS, but the implementation needs to change.
For example, the IN called for services and applications to be located in the core of
the network instead of on the network switches themselves. The idea was to reduce the
cost of supporting services and applications by eliminating the need to replicate the
service at every single network node.
However, for this to work, special software was required at every switch responsible
for delivering the service. The switch software was responsible for accessing the service
control point (SCP) responsible for providing the service. The software ???triggers??? became
extremely expensive, and therefore it became prohibitive to launch some services
on a grand scale in the smallest of networks.
When the public began pushing for more mobility, the technologists of the industry
once again demonstrated how this could be accomplished using the existing architecture
of the world??™s networks, utilizing SS7 and the IN.
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