vb.net barcode generator Features in the PSTN in Software

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Features in the PSTN
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Custom Local Area Signaling Service (CLASS) features are basic services available in each local access and transport area (LATA). The features and the services they offer are a function of Class 5 switches and Signaling System 7 (SS7) networks. The Class 4 switch offers no features of its own. It transmits the features of the Class 5. With almost three decades of devel-
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opment, the Class 4 switch has a well-established history of seamless interoperability with the features offered by the Class 5 and SS7 networks. The features often enable service provider systems to offer high margins that result in stronger revenue streams. Examples of features offered through a Class switch can be grouped into two major categories: basic and enhanced services. Examples of basic services include 1 , 800/900 service, travel cards, account codes, personal identification numbers (PINs), operator access, speed dialing, hotline service, automatic number identification (ANI) screening, virtual private networks (VPNs), calling cards, and call-detail recording. Enhanced services include information database services (NXX number service, authorization codes, calling card authorization, debit/prepaid card), routing and screening (includes CIC routing, time-of-day screening, ANI screening, class-of-service screening), enterprise networks, data and video services (dedicated access lines, Integrated Services Digital Network [ISDN] primary rate interface [PRI] services, dialable wideband services, and switched 56 Kpbs), and multiple dialing plans (full 10-digit routing, 7-digit VPN routing, 15-digit international dialing, speed dialing, and hotline dialing). Most of these features have been standard on Class switches for many years. The previous long list of features is evidence of the importance of features in the legacy market in which they were developed. Service providers will not give up these features and the margins they generate. In the converging market, features are equally important to reliability as service providers don t want to offer fewer features to their customers, and they will want to continue to offer high-margin features. A softswitch solution emphasizes open standards as opposed to the legacy Class 4 or 5 switch that historically offered a proprietary and closed environment. A carrier was a Nortel shop or a Lucent shop. No components (hardware or software) from one vendor would be compatible with products from another vendor. Any application or feature on a DMS-250 (Nortel s Class 4 switch), for example, must be a Nortel product or specifically approved by Nortel after a lengthy and rigorous testing period. New features could come only from the vendor and would usually take a minimum of 18 months for development and delivery. They would also often cost in the millions of dollars. Softswitch-open standards are aimed at freeing service providers from vendor dependence and the long and expensive service development cycles of legacy switch manufacturers.
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Features and Signaling
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Features are a function of the Class 5 switch and the SS7 network. So how are the ANI features of the Public Switched Telephone Network (PSTN) transferred to a converging market where the softswitch competes with the Class 4 or 5 switch Firstly, SS7 information generated in the PSTN must be transported transparently across the IP network. The preceding chapter described SS7 over IP. It is possible with mechanisms that make it easier for service providers to quickly roll out new, high-margin services that the voice market will shift in favor of the service provider that can deliver those features quickly. It should be noted here that softswitch could enable a service provider to offer expanded features that are made available via the subscriber s PC or IP handset. The PC offers greater flexibility than a telephone handset in the range of communications between the subscriber and the switch. For example, *11 or any other handset input is limited relative to all that can be offered on a web page. In theory, if the 3,500 or so Class 5 features were cataloged on a web site and made more convenient for a subscriber to use, the service provider could better capitalize on those features. To date, Class 4 or 5 switches offer only the telephone handset as a user interface to features. The service creation environment (SCE) of softswitch is almost unlimited and has the potential to change much of the switch market in favor of softswitch. Softswitch has the capability to relay existing features of the Class 5 and SS7 networks. In addition, as Figure 10-1 illustrates, it can offer a variety of new features, potentially leading to a total count of features in excess of the 3,500 features of the Class 5 switch.
The Intelligent Network/Advanced Intelligent Network (IN/AIN)
How are features delivered In the PSTN, features are made possible by the Intelligent Network/Advanced Intelligent Network (IN/AIN) and SS7. The IN/AIN is a telephone network architecture that separates service logic from switching equipment, enabling new services to be added without having to redesign switches to support new services. Two concepts are contained in the IN/AIN. In the first, the network controls the routing of calls within it from moment to moment based on some criteria other than finding a path through the network for the call based on
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Features and Applications: It s the Infrastructure, Stupid!
Features and Applications: It s the Infrastructure, Stupid!
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