This is powerful for any VoIP implementation because today many VoIP networks are
highly susceptible to fraud. This is partly because of the lack of enforced procedures
such as authentication.
SIP does have its problems however. As with any new technology there is room for
improvement. The same holds true for the IMS architecture. Certainly there is room
for improvement; however, the benefits far outweigh the shortcomings.
The primary benefit in this author??™s mind is security. When looking at VoIP issues,
many of those issues center around fraud and access breaches. This is because the
version of SIP defined for this domain is not very robust, since it was developed in the
spirit of the public Internet.
Before going on to discuss the various network entities in more detail, we will first
look at current network infrastructures so that you can better understand the differences
as well as the concepts of telecommunication networks. The IN architecture is
shown in Figure 1.1. Note that the database functions are more central in the network.
Their role is not defined as part of the IN architecture, since their role differs depending
on the service they are providing. The databases in the network are used to deliver the
applications such as Calling Name and Number Portability.
Figure 1.1 The Intelligent Network (wireline implementation)
SSP SSP
STP
STP
STP
STP
SCP
6 Chapter 1
The central core function in the IN is the signal transfer point (STP).
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