vb.net barcode generator Figure 3-11 Architecture of Class 4 switches with VoIP gateways in Software

Creation QR-Code in Software Figure 3-11 Architecture of Class 4 switches with VoIP gateways

Figure 3-11 Architecture of Class 4 switches with VoIP gateways
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Telephone Class 4 Switch Class 5 Switch
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Telephone Class 5 Switch Class 4 Switch
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Figure 3-12 Class 4 replacement softswitch solution. Note the absence of Class 4 TDM switches.
Data
Application Server
SIP Proxy Server
IP Network
VOIP Gateway
VOIP Gateway
Telephone
Telephone
Class 5 Replacement Softswitch
The next level of progression in the development of softswitch technologies was the Class 5 replacement (see Figure 3-13). This has led the most exciting debate over softswitch. The ability of the softswitch industry to replace
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Softswitch Architecture or It s the Architecture, Stupid!
Softswitch Architecture or "It's the Architecture, Stupid!"
Figure 3-13 Class 5 replacement softswitch solution
Application Server
Data
Softswitch
IP Network
VOIP Gateway
VOIP Gateway
Telephone
Telephone
the Class 5 marks the final disruption of the legacy telecommunication infrastructure. A Class 5 switch can cost tens of millions of dollars and require at least half a city block in real estate. The evolution of a successful Class 5 replacement softswitch has staggering implications for the world s local telephone service providers. From the early days of the telephone industry, it was assumed that the cost of deploying local phone service with its copper pair access and local phone switches (most recently, a Class 5) was so expensive that only a monopoly could affect this economy of scale and scope. Enter a Class 5 replacement softswitch that does not cost tens of millions of dollars nor require a centrally located and expensive central office, and the barriers to entry and exit crumble. The result is that new market entrants may be able to effectively compete with quasi-monopolistic incumber service providers. This is potentially disruptive to incumbent local service providers and their Class 5 switch vendors. Objections to a Class 5 replacement softswitch solution include the need for E911 and Communication Assistance for law Enforcement Act of 1994 (CALEA). This will be addressed in a later chapter. Another objection is the perception that softswitch cannot match Class 5 features. A 5ESS Class 5 switch from Lucent Technologies is reported to have some 3,500 features that have been developed over a 25-year time frame. This features debate will be addressed in a later chapter. At the time of this writing, a number of successful Class 5 replacement softswitch installations have taken place and this segment of the industry is growing rapidly.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
Softswitch Architecture or It s the Architecture, Stupid!
3
In summary, the softswitches that replace PBXs and Class 4 and 5 switches (including Centrex) are differentiated in their scale. That is, their processing power is measured by the number of busy-hour call attempts or calls per second they can handle. Other differentiating factors include their capability to handle features from a feature server and interface disparate signaling protocols. A softswitch is software that rides on a server. The limitations are the complexity of the software and the processing power of the server.
Transport
Transport is the means by which voice is transported across the network. It connects the switches in the network. The Memorandum for Final Judgement (MFJ) in 1984 broke up AT&T and opened the long-distance market to competition. In essence, this opened the transport market. Simply put, three modes of voice transport are in use today: IP, Asynchronous Transfer Mode (ATM), and TDM.
Legacy, Converging, and Converged Architecture
VoIP and softswitch technologies rose out of the economic necessity for longdistance service providers to switch to the least expensive means of transport, which is IP. By bypassing TDM and ATM networks, long-distance service providers greatly reduced their costs of long-distance transport, which made them more competitive and more profitable than their TDM- or ATM-equipped competitors. Softswitch and VoIP got their beginnings in the transport aspect of the network. Long-distance service providers needed an intelligence that would perform call control over the IP network they used for their transport. In addition, softswitch needed to interface SS7 to the IP network, and finally it had to control the transmission of features across the IP network. Thus was born the Class 4 replacement softswitch. The following paragraphs detail its evolution from the legacy network to the converging network and use in the converged network. Service providers speak of a telecommunications market where voice, data, and perhaps video and other broadband services are provided over a single network, presumably based on IP. The subscriber consequently
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
Softswitch Architecture or It s the Architecture, Stupid!
Softswitch Architecture or "It's the Architecture, Stupid!"
enjoys highly efficient IP services desktop to desktop. This is called a converged network. The vast majority of the Class 4 and 5 switch market was designed and installed when voice and data were handled via separate channels. These are referred to as legacy networks (see Figure 3-14). This book refers to the transition network as a converging network (see Figure 3-15). To define the markets for Class 4 and 5 versus softswitch, it is important to understand that legacy markets apply to legacy networks where voice and data are separate networks. A converging market applies to converging networks, where, in most instances, the legacy infrastructure of Class 4 and 5 switches remains at the periphery of the network while the core of the network is IP, which provides efficient voice transport. A converged market applies to a converged network where voice and data are handled on one network (see Figure 3-16). In the converged market, voice switching is performed by classless switches. This is because the limitations of geography defined a Class 5 switch as providing local service and a Class 4 switch as providing long distance. If geography is irrelevant, then a Class designation is irrelevant.
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