It was this very model that
led to the implementation of SS7 and the IN. The concept of an IN was a brilliant concept,
but it failed because the cost to implement an IN was too prohibitive. Software
required on every switch in the network for accessing the IN is what raised the cost of
implementation of an IN, although the benefits were clear. It was wireless that demonstrated
the value of core functions such as call control through the support of features
and capabilities such as roaming.
IMS builds on this theme, providing the additional benefit of controlling all communications,
not just voice and data. Supporting messaging, e-mail, and file downloads
under one common control provides many economies of scale to service providers and
affords them the ability to provide new services (such as presence) that are not feasible
using other models.
The IMS is yet another level of evolution within the GSM strategy, yet it provides
many benefits to cable and wireline providers as well. IMS is not so much a new technology
as it is an implementation standard for existing technologies. SIP for example is
not new but is already implemented in numerous VoIP networks worldwide. The IMS
brings SIP to a core function where everything can be controlled and managed more
efficiently. It also provides security for wireline providers that does not seem to be there
in traditional VoIP implementations.
Pages:
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32