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Introduction As the world rushes into the information age, telecom customers demand new, faster, and more reliable services This places increasing demands on digital networks Expansion of these networks increases the deployment and reliance upon the common-channel signaling system no 7 (CCS/SS7) SS7 enables faster, more efficient and more reliable routing of communications and creates the opportunity for new revenue-generating services With the increased rate of growth, the complexity and diversity of SS7 networks increases This, along with the shortage of skilled SS7 engineers, makes it increasingly difficult to monitor and manage SS7 networks An SS7 signaling monitoring system provides the tools to support these SS7 networks Some important features of a typical system are:
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Network-wide SS7 monitoring and real-time, centralized reporting for early warning of revenue-threatening conditions Graphical display of critical information, for a clear view of key network information Nonintrusive connection to the SS7 network that does not impact SS7 network reliability Nondependence on network elements such as switches, so it can provide networkwide, independent results Alarm management, protocol analysis, and call trace provide the ability to troubleshoot network problems Call detail record collection to facilitate usage billing, fraud detection/control, etc
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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SS7 Signaling Monitoring Systems 762 Network Management
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Introduction to Out-of-Band Signaling Systems A telephone system is composed of two network types: the speech path (trunk) network that carries the voice channels between exchanges and ultimately between the customer s telephones, and the signaling network that performs the interexchange control required for call processing The signaling network carries all the data messages used in setting up calls between computer-controlled telephone switches These messages conform to a layered network protocol known as Signaling System No 7 (or SS7) When a call is made between two telephones, several steps are required to perform the dialing, ringing (or busy), answer, and hang-up operations Signaling messages communicate these steps among the various switches involved in processing a call These signaling messages instruct the switch to generate the appropriate tone (ringing tone, for example), or to divert the call to a prerecorded message such as an announcement that a number no longer is in service Figure 331 shows a simplified view of telephone network infrastructure This view of the telephone network shows two telephones connected to End Office switches (local telephone exchanges) and a trunk path between these switches passing through a tandem switch Above the trunk and switch level there are signaling links and signaling transfer points or STPs The STPs act as packet routers, passing signaling messages towards their destination The triangular symbol of shown in Figure 331 represents a Service Control Point or SCP A common example of a service is an 800 free phone number database, which could be held within an SCP A switch, receiving an 800 call, sends a
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Figure 331 A simplified view of a telephone network infrastructure Even a simple telephone call re-
quires several steps and end-to-end network access to set up and later release the connection based on information in network databases Special billing options such as credit card calls and third-party billing require additional database look-ups All this is done via the SS7 network, a packet-switched network comprising signaling links, switching transfer points (STPs), and switching control points (SCPs) Switching control points are databases filled with network routing and billing information Signaling transfer points are packet switches Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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