These
systems typically operate in a real-time mode, providing limited storage (anywhere
from three minutes to three days). This is typically fine for most troubleshooting, but
some applications require much more storage capacity.
The purpose of the network monitoring system is to report on the health of the signaling
network and all of its facilities. This involves alarming when signaling links fail
or reach congestion, and reporting on the status of the signaling entities themselves.
Over the last several years, these same systems have begun providing call detail records
(CDRs) based on the SS7 signaling.
These CDRs are then fed to other systems such as fraud management applications
and billing systems used for inter-carrier billing. These systems were not designed for
38 Chapter 2
the tasks many operators need today, simply because there were no requirements to
monitor anything more than the voice setup.
In the IMS, monitoring is much different. The IMS supports all sorts of transactions,
and it supports many different types of protocols on the data side (such as HTTP and
FTP). SIP is used to provide session control, but there are many Internet protocols
that are used to access various files and services that must be monitored along with
the SIP.
Also consider that the IMS is all-IP, so tapping into the IMS requires tapping into
the routers used to interconnect the various IP facilities.
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