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| at&t voip client download: Popular Science , 2004-08 Popular Science gives our readers the information and tools to improve their technology and their world. The core belief that Popular Science and our readers share: The future is going to be better, and science and technology are the driving forces that will help make it better. |
| at&t voip client download: PC Mag , 2005-02-08 PCMag.com is a leading authority on technology, delivering Labs-based, independent reviews of the latest products and services. Our expert industry analysis and practical solutions help you make better buying decisions and get more from technology. |
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| at&t voip client download: PC Mag , 2005-02-08 PCMag.com is a leading authority on technology, delivering Labs-based, independent reviews of the latest products and services. Our expert industry analysis and practical solutions help you make better buying decisions and get more from technology. |
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| at&t voip client download: Network World , 2003-08-18 For more than 20 years, Network World has been the premier provider of information, intelligence and insight for network and IT executives responsible for the digital nervous systems of large organizations. Readers are responsible for designing, implementing and managing the voice, data and video systems their companies use to support everything from business critical applications to employee collaboration and electronic commerce. |
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| at&t voip client download: Network World , 2001-03-05 For more than 20 years, Network World has been the premier provider of information, intelligence and insight for network and IT executives responsible for the digital nervous systems of large organizations. Readers are responsible for designing, implementing and managing the voice, data and video systems their companies use to support everything from business critical applications to employee collaboration and electronic commerce. |
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| at&t voip client download: Asterisk Jim Van Meggelen, Leif Madsen, Jared Smith, 2007-08-28 Provides information on Asterisk, an open source telephony application. |
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| at&t voip client download: Computerworld , 2006-05-29 For more than 40 years, Computerworld has been the leading source of technology news and information for IT influencers worldwide. Computerworld's award-winning Web site (Computerworld.com), twice-monthly publication, focused conference series and custom research form the hub of the world's largest global IT media network. |
| at&t voip client download: Network World , 2002-02-04 For more than 20 years, Network World has been the premier provider of information, intelligence and insight for network and IT executives responsible for the digital nervous systems of large organizations. Readers are responsible for designing, implementing and managing the voice, data and video systems their companies use to support everything from business critical applications to employee collaboration and electronic commerce. |
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| at&t voip client download: The Theory and Practice of Online Learning Terry Anderson, 2008 Neither an academic tome nor a prescriptive 'how to' guide, The Theory and Practice of Online Learning is an illuminating collection of essays by practitioners and scholars active in the complex field of distance education. Distance education has evolved significantly in its 150 years of existence. For most of this time, it was an individual pursuit defined by infrequent postal communication. But recently, three more developmental generations have emerged, supported by television and radio, teleconferencing, and computer conferencing. The early 21st century has produced a fifth generation, based on autonomous agents and intelligent, database-assisted learning, that has been referred to as Web 2.0. The second edition of The Theory and Practice of Online Learning features updates in each chapter, plus four new chapters on current distance education issues such as connectivism and social software innovations.--BOOK JACKET. |
| at&t voip client download: Network World , 2002-08-05 For more than 20 years, Network World has been the premier provider of information, intelligence and insight for network and IT executives responsible for the digital nervous systems of large organizations. Readers are responsible for designing, implementing and managing the voice, data and video systems their companies use to support everything from business critical applications to employee collaboration and electronic commerce. |
| at&t voip client download: Computer Networks Andrew S. Tanenbaum, David Wetherall, 2011 This edition reflects the latest networking technologies with a special emphasis on wireless networking, including 802.11, 802.16, Bluetooth, and 3G cellular, paired with fixed-network coverage of ADSL, Internet over cable, gigabit Ethernet, MPLS, and peer-to-peer networks. It incorporates new coverage on 3G mobile phone networks, Fiber to the Home, RFID, delay-tolerant networks, and 802.11 security, in addition to expanded material on Internet routing, multicasting, congestion control, quality of service, real-time transport, and content distribution. |
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| at&t voip client download: CCNA Voice 640-461 Jeremy Cioara, Michael Valentine, 2011 Learn, prepare, and practice for exam success, master CCNA voice 640-461 exam topics, and assess your knowledge with chapter-opening quizzes. Review key concepts with exam preparation tasks and practice with realistic exam questions on the CD-ROM. |
| at&t voip client download: PacketCable Implementation Jeff Riddel, 2012-01-10 PacketCable Implementation is the first complete primer on PacketCable network design, provisioning, configuration, management, and security. Drawing on consulting experience with every leading cable operator, Jeff Riddel presents real-world case studies, sample network designs, configurations, and practical tips for all facets of PacketCable planning and deployment. This book's end-to-end coverage has been designed for cable engineers and networking professionals with widely diverse backgrounds and experience. Topics covered include PacketCable specifications and functional components, multimedia terminal adapters (MTA) provisioning, call signaling, media streaming, quality of service (QoS), event messaging, security, and much more. Every chapter contains tables and charts that serve as quick, easy references to key points. Each chapter closes with a summary and chapter review questions designed to help you assess and deepen your understanding. PacketCable Implementation brings together everything you need to know about cable networking to service delivery. Discover the PacketCable big picture, including key application opportunities Learn about the latest generation of PacketCable standards and specifications, including PacketCable 2.0 and DOCSIS 3.0 Understand the functional components of a PacketCable network and how they fit together Walk step-by-step through provisioning, including protocols, flows, and MTA configuration Gain an in-depth understanding of call signaling: message formats, Network-based Call Signaling (NCS), PSTN interconnects, Call Management Server Signaling (CMSS), and more Implement efficient, high-performance media streaming Deploy, analyze, manage, and troubleshoot a state-of-the-art QoS framework Manage crucial network considerations, including lawful intercept This book is part of the Networking Technology Series from Cisco Press®, which offers networking professionals valuable information for constructing efficient networks, understanding new technologies, and building successful careers. Category: Cisco Press–Networking Covers: Broadband Multimedia |
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| at&t voip client download: Beyond VoIP Protocols Olivier Hersent, Jean-Pierre Petit, David Gurle, 2005-03-04 In 1999-2000, VoIP (Voice-over-IP) telephony was one of the most successful buzzwords of the telecom bubble era. However, in 2001-2003, VoIP faced a very tough reality check. Now, manufacturers and service providers are drawing on what they have learnt from past experience in order to prepare to participate in the next major challenge faced by the telecommunications industry. This book offers a comprehensive overview of the issues to solve in order to deploy global revenue-generating effective multimedia services. Drawing on extensive research and practical deployment experience in VoIP, the authors provide essential advice for those seeking to design and implement a post-bubble VoIP network. Beyond VoIP Protocols: Understanding Voice Technology and Networking Techniques for IP Telephony Introduces the basics of speech coding and voice quality Demonstrates how quality of service may be built into the network and deals with dimensioning aspects, e.g. multipoint communications and how to model call seizures. Explores the potential of multicast to turn an IP backbone into an optimized broadcast medium Includes amply illustrated, state-of-the-art practical advice for formulating a complete deployment strategy A companion volume to IP Telephony: Deploying VoIP Protocols, this book takes the reader a stage deeper into how to prepare the network and exploit VoIP technology to its full potential. |
| at&t voip client download: TrixBox Made Easy Barrie Dempster, Kerry Garrison, 2006 The book is incremental and structured in its approach. It starts by clearly describing the basics of PBX systems and of Asterisk itself, on which Trixbox is based. Then the book explains how TrixBox links to, and controls Asterisk. Once the core concepts are understood, the book carefully takes you through each stage of setting up and managing your VoIP system with an abundance of screenshots for easy implementation. Because the book covers the concepts and practices of both telephony and Asterisk, it is suitable for both professional and home users with no prior telecom experience. It's ideal for any user wishing to set up a telephony system for individual or small business usage. No previous knowledge of Trixbox or networking is required, although some basic knowledge of PBX and Linux would be an advantage. |
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| at&t voip client download: Ethics for the Information Age Michael Jay Quinn, 2005 Ethics for the Information Age offers students a timely, balanced, and impartial treatment of computer ethics. By including an introduction to ethical theories and material on the history of computing, the text addresses all the topics of the Social and Professional Issues in the 2001 Model Curricula for Computing developed by the ACM and IEEE Computer Society. By introducing ethical theories early and using them throughout the book to evaluate moral problems related to information technology, the book helps students develop the ability to reach conclusions and defend them in front of an audience. Every issue is studied from the point of view of multiple ethical theories in order to provide a balanced analysis of relevant issues. Earlier chapters focus on issues concerned with the individual computer user including email, spam, intellectual property, open source movement, and free speech and Web censorship. Later chapters focus on issues with greater impact on society as a whole such as privacy, computer and network security, and computer error. The final chapter discusses professionalism and the Software Engineering Code of Ethics. It invites students to contemplate the ethical dimensions of decisions computer professionals must frequently make. |
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| at&t voip client download: Coordinating the Internet Fredrik Lindeberg, 2019-12-10 Många självklarheter i vårt digitala samhälle är beroende av Internet för att fungera. Allt från smarta dörrar för hemtjänster, till självscanningsapparaterna på ICA, till nyare bilar, moderna tillverkningsrobotar, telefoner och affärssystem. Den här licentiatavhandlingen reder ut vad Internet är, hur det styrs och vad det har för praktiska konsekvenser. Tidigare forskning finns bland annat inom telekommunikation där Internet liknas vid andra telekommunikationstjänster, så som kabel-TV eller mobiltelefoni, och inom digitalisering både inom management och informationssystem där Internet i det närmaste tas för givet som teknisk infrastruktur. Här tar jag en ansatts där jag förklarar Internet ur ett kombinerat tekniskt och organisatoriskt perspektiv. Studien är principiellt uppdelad i tre delar. Den första delen fokuserar på att begreppsmässigt hitta ett sätt att diskutera Internet utan att essentiella aspekter faller bort, såsom styrningen eller konsekvenser av den tekniska designen. Jag landar i att Internet är både ett tekniskt och ett organisatoriskt fenomen. Tekniskt i bemärkelsen att det handlar om digital paketbaserad kommunikation (dvs att olika paket kan ta olika väg och att det inte finns ett beroende på en viss specifik väg, eller “krets”), vilket kan särskiljas från exempelvis kretskopplad kommunikation (dvs en specific väg från sändare till mottagare) eller rent analog kommunikation. I denna tekniska dimension är Internet förhållandevis likt klassisk telekommunikation såsom kabel-TV och mobiltelefoni, och förlitar sig på best-effort paketbaserad kommunikation. I den andra dimensionen, styrning och organisation, är Internet ett explicit bottom-up fenomen som styrs med andra principer och ideal än klassisk telekommunikation. Till sin utformning är denna minsta möjliga koordination som krävs för att möjliggöra koordinering av de tekniska unika identifierare som behövs för att Internet ska fungera (dvs idag DNS- och BGP-flororna av protokoll för användning av namn och nummer på Internet). Båda dimensionerna, de organisatoriska och tekniska, följer samma designprinciper, och generellt är det meningsfullt att se Internet som en ekologi av aktörer snarare än en organisation i strikt teoretiska termer (exempelvis finns ingen tydlig övergripande strategi, organisationsnummer eller löneutbetalare). Det är dessa designprinciper, som ligger väl i linje med systemarkitektursprinciper för datorsystem, som är orsaken till Internets lager-design där man (generellt) inte ska bry som om vad som händer på andra lager än sitt eget (beskrivet som “separation of concerns” eller i dubbel negation “high cohesion” i texten) samt att ha en minimalistisk ansatts till koordinering och enbart koordinera eller skapa beroenden mellan enheter (både tekniskt och organisatoriskt) när det verkligen behövs (beskrivet som “minimum coordination” eller “low coupling” i texten). Den andra delen fokuserar på hur Internet kan socialt påverkas eller förändras till något annat, eller till något med en annan funktion sett som en styrd organisation. Jag använder begreppet social robusthet, som motpol till teknisk robusthet som i hur man tekniskt kan förstöra Internet, för att diskutera dessa aspekter. Slutsatserna här mynnar ut i att Internets explicita bottom-up och problemsuppdelnings-design gör det märkbart svårt för någon att medvetet påverka Internet för att ändra dess beskaffenhet, och dessutom visar jag att även om man praktiskt lyckas ta över de formellt beslutande råden (exempelvis ICANNs och IETFs styrelser) så finns det inga formella eller praktiska hinder för att bara ignorera dem (dvs switching costs för just ICANN eller IETF är låga, om än tekniskt omständligt med att konfigurera om rötter och routing-tabeller, och betydligt enklare än att gå från IPv4 till IPv6 då utrustning kan behöva ersättas och därmed en betydligt högre switching cost). Med andra ord, det är enklare att byta ut Internets koordinerare än att byta ut Internet mot något som fungerar annorlunda. Däremot är den rådande politiska världsordningen ett hot mot Internet, eftersom den regelstyrda och koordinerade världsordningen inte längre är lika självklar som den varit tidigare. Den tredje och sista studien fokuserar på nätneutralitet, dvs rätten nätverksoperatörer har att fånga värde i andra dimensioner än trafikmängd, som en praktiskt effekt av hur Internet styrs och fungerar. Det primära praktiska bidraget är att nätneutralitet inte får ses som enbart en reglerings och lagstiftningfråga utan det är mer relevant att prata om i termer av nätneutralitet i praktiken. I den bemärkelsen är lagstiftningens vara eller inte vara mindre intressant än praktisk nätneutralitets vara eller inte vara och en tyngdpunktsförskjutning i den offentliga debatten hade fört diskussionen närmare hur Internet fungerar. Sammanfattningsvis ger Internets designprinciper att marknadskrafter, och ej direkt reglering, ska möjliggöra nätneutralitet. För att förtydliga, tanken är att det ska finnas konkurrens inom de flesta nivåer eller lager, och att det är av vikt att det finns konkurrens rakt igenom så att en kundvilja för paketneutralitet på tjänstenivå även påverkar nätägar- och infrastrukturnivå, så att det är användarnas efterfrågan som leder till nätneutralitet (om den användarviljan finns). Dock kan det mycket väl vara så att man som användare inte är intresserad av nätneutralitet och då ska tjänsteleverantörer, nätägare och infrastrukturoperatörer inte heller tvingas vara neutrala genom lagstiftning då det går stick i stäv med designprinciperna. Inte heller ska en grupps vilja kring nätneutralitet påverka andras möjligheter att välja. Genomgående identifierar jag två kolliderande världsbilder, den distribuerade regelstyrda och koordinerade ordningen i sitt perspektiv med sina förkämpar, och den mer integrerande och suveräna världsordningen med sitt perspektiv och sina förkämpar. Rent praktiskt uppfyller Internet en önskad funktion i den tidigare men ej i den senare, då Internet designmässigt är byggt för att tillåta snarare än kontrollera och bestämma. Exempelvis finns det inte inbyggda (tekniska) mekanismer i Internet för att till exempel möjliggöra statlig övervakning eller kontroll av material som finns tillgängligt, och då ligger det mer i statens intresse att ha kontrollerade telekommunikationstjänster, såsom kabel-TV, mobiltelefoni och liknande lösningar där man inte helt enkelt kan lägga på ett “extra lager” för att uppnå kryptering, anonymitet eller tillgång till andra tjänster. I texten använder jag perspektiven tillsammans med teknologi, marknader och byråkrati för att fånga upp dynamiken och strömningarna i Internet-ekologin och jämför med tekniska samhällsförändringar, som exempelvis järnvägsnät, postverk och finansiella marknader. Jag konstaterar att Internet har varit styrt av teknologiskt baserade värderingar, till skillnad från de andra exemplen som i huvudsak har utformats av dynamiken mellan byråkrati och marknad. I denna mån förelår jag att teknologi kan användas som strömning och motperspektiv till den klassiska uppställningen med byråkrati och marknad för att beskriva fenomen i digitaliseringens tidsålder. Avhandlingen sätter även pågående trender i ett bredare perspektiv mot både organisation och teknik, och trycker på vikten av att förstå delarna var för sig och tillsammans för att på ett rikare sätt måla upp helheten. The modern society is to a large extent Internet-dependent. Today we rely on the Internet to handle communication for smart doors, self-scanning convenience stores, connected cars, production robots, telephones and ERP-systems. The purpose of this thesis is to unbundle the Internet, its technology, its coordination, and practical and theoretical consequences. Earlier research has, in telecommunications, focused on the Internet as one of many potential telecommunications services, such as cellphones or cable-TV, and the management and information systems field has by and large treated the Internet as black-boxable infrastructure. This thesis explains the Internet from the combined perspectives of technology and coordination. This text contains three empirical studies. The first is focused on conceptualizing and discussing the Internet in a meaningful way using both technology and coordination frameworks. I unceremoniously conclude that the Internet is both a technological and a coordination phenomenon and neither of these aspects can be ignored. The Internet is technological in that it concerns digital packet switched digital communication (as opposed to circuit switched) or purely analog communications. The technological dimension of the Internet is similar in its constituency to classical telecommunications networks, and has best-effort mechanisms for packet delivery. In the other dimension, coordination, the Internet is an explicit bottom-up phenomenon minimally coordinated (or governed) by other ideals than classical telecommunications networks and systems. At its core this least necessary coordination concerns technical unique identifiers necessary for inter-network communication (in practice today manifested as naming with the DNS protocol suite, and numbering with the BGP protocol suite). Both dimensions follow similar design characteristics; the design of the technical Internet is similar to the design of the coordination of the Internet. These design principles, which are well aligned with software design principles, is the cause of the Internet’s layered design (“separation of concerns” in practice) and minimal view of coordination (the “least coordinated Internet”). In general terms it is fruitful to view the Internet and involved actors as an ecology, rather than one organization or entity in need of governance or control. The second study looks at the social resilience of the Internet. That is, is it possible through social means to change what the Internet is or can be viewed as. I use social resilience as a counterpart to technical resilience, i.e. resilience to technical interference. In essence, the bottom-up and separations of concerns design of the coordination aspect of the Internet minimizes possible influence of actors intent on mission disruption. I also practically show that even a take-over of the central councils have little effect the constituency of the Internet, since these councils are not invested with formal powers of enforcement. This thesis suggests that the cost of switching from ICANN and IETF to another set of organizations is quite low due to the nature of the coordination of the Internet, compared to for example, switching all equipment to IPv6 capable equipment. However, the current political situation is a threat to the current Internet regime, since an international and rule-based world order is no longer on all states’ agendas. The final empirical study focus on the practical and theoretical implications of the Internet on the case of net neutrality. The primary contribution is that de facto and de jure net neutrality differ in practice, and as such de facto net neutrality deserves more attention. Also, I suggest that any regulation, either for or against net neutrality, is problematic, since such regulation would interfere with the inherent coordination mechanisms of the Internet. As such regulation should focus on providing the necessary markets for Internet function given the coordination and design of the Internet. As a net neutrality example, net neutral Internet access options should exist as part of a natural service offering if wanted by customers, not due to direct regulation. Throughout the thesis I identify two colliding world orders, both in terms of digital communication networks and terms of organizing society in general: the rule-based and coordinating order with its champions, and the integrated or sovereign order with its champions. In practical terms, the Internet can be considered a want in the former (the distributed perspective), but not the later (the integrative perspective), since the Internet lacks inherent (technical) controls for surveillance and content control which are necessary in a world order where borders are important. Regardless of if that importance stems from state oversight or intellectual property rights legislation. I use these perspectives together with technology, markets and bureaucracy to catch the dynamics of the Internet ecology. I then compare these dynamics with other technological and societal phenomena, such as railway networks, postal services and financial markets. And conclude that the Internet (as conceptualized in this thesis) can best be explained by technological values, in opposite to the other examples which can best by explained by the dynamics of markets and bureaucracies without any real influence of the values of technology. As such, I suggest that the classical frame of markets and bureaucracy can fruitfully be expanded with technology to better explain the Internet and similar digitization phenomena. This thesis puts current trends in a broader perspective based on technology and organization, where the two perspectives together better can draw the full picture in a rich fashion. |
| at&t voip client download: Foundations of Security Christoph Kern, Anita Kesavan, Neil Daswani, 2007-05-11 Foundations of Security: What Every Programmer Needs to Know teaches new and current software professionals state-of-the-art software security design principles, methodology, and concrete programming techniques they need to build secure software systems. Once you're enabled with the techniques covered in this book, you can start to alleviate some of the inherent vulnerabilities that make today's software so susceptible to attack. The book uses web servers and web applications as running examples throughout the book. For the past few years, the Internet has had a wild, wild west flavor to it. Credit card numbers are stolen in massive numbers. Commercial web sites have been shut down by Internet worms. Poor privacy practices come to light and cause great embarrassment to the corporations behind them. All these security-related issues contribute at least to a lack of trust and loss of goodwill. Often there is a monetary cost as well, as companies scramble to clean up the mess when they get spotlighted by poor security practices. It takes time to build trust with users, and trust is hard to win back. Security vulnerabilities get in the way of that trust. Foundations of Security: What Every Programmer Needs To Know helps you manage risk due to insecure code and build trust with users by showing how to write code to prevent, detect, and contain attacks. The lead author co-founded the Stanford Center for Professional Development Computer Security Certification. This book teaches you how to be more vigilant and develop a sixth sense for identifying and eliminating potential security vulnerabilities. You'll receive hands-on code examples for a deep and practical understanding of security. You'll learn enough about security to get the job done. |
| at&t voip client download: Wireless Networking Technology Steve A. Rackley, 2011-02-23 As the demand for higher bandwidth has lead to the development of increasingly complex wireless technologies, an understanding of both wireless networking technologies and radio frequency (RF) principles is essential for implementing high performance and cost effective wireless networks.Wireless Networking Technology clearly explains the latest wireless technologies, covering all scales of wireless networking from personal (PAN) through local area (LAN) to metropolitan (MAN). Building on a comprehensive review of the underlying technologies, this practical guide contains 'how to' implementation information, including a case study that looks at the specific requirements for a voice over wireless LAN application. This invaluable resource will give engineers and managers all the necessary knowledge to design, implement and operate high performance wireless networks.· Explore in detail wireless networking technologies and understand the concepts behind RF propagation.· Gain the knowledge and skills required to install, use and troubleshoot wireless networks.· Learn how to address the problems involved in implementing a wireless network, including the impact of signal propagation on operating range, equipment inter-operability problems and many more.· Maximise the efficiency and security of your wireless network. |
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