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Technologia VoIP integruje transmisje głosu i danych. Szybko staje się bardzo ważnym czynnikiem komunikacji sieciowej. Pozwala obniżyć koszty operacyjne, daje większą elastyczność działania, pozwala na korzystanie z wielu rozszerzających aplikacji. Książka przedstawia wyczerpujący opis tej nowej technologii, aby dopomóc specjalistom z zakresu telefonii i przetwarzania danych w planowaniu i organizacji nowych sieci. Publikacja prezentuje budowę i działanie nowoczesnej infrastruktury telefonicznej, zasadnicze koncepcje dotyczące danych i głosu w sieci, transmisję głosu jako danych oraz protokoły sygnalizacyjne IP używane w sieciach we współpracy z dzisiejszymi systemami telefonicznymi. Autorzy omawiają różne zalety i aplikacje VoIP i pokazują jak zapewnić w sieci dobrą jakość głosu. Czytelnik znajdzie tu:- wprowadzenie do usług PSTN protokołów sygnalizacyjnych IP, w tym SS7;- informacje o tym jak VoIP może współpracować z istniejącym systemem telefonicznym, w sposób efektywny i skalowalny; - omówienie takich zagadnień VoIP jak zakłócenia, opóźnienie, utrata pakietów, kodeki, narzędzia jakości usług oraz średnie wyniki; - przedstawienie komponentów funkcjonalnych związanych z użyciem bram Cisco potrzebnych do wprowadzenia sieci VoIP.

Your first step into the world of IP telephony * No IP telephony experience required * Includes clear and easily understood explanations * Makes learning easy Your first step to the world of IP telephony begins here! * Learn how voice and data communications merge in voice-over-IP technology * Use this reader-friendly guide to understand the benefits of this technology * Explore real-life applications and theories through case studies in every chapter Welcome to the world of voice over IP We use either a telephone or e-mail for much of our day-to-day communication. Today, these two worlds are merging, and companies can place phone calls over their existing data network infrastructures using a technology called voice over IP (VoIP). No prior experience with VoIP technology is required Voice over IP First-Step is anyone's introduction to the world of VoIP networks. The concepts in this book are presented in plain language, so you don't need in-depth background knowledge to comprehend the technologies covered.If you work with data networks, if you work with telephony networks, if you're a home user interested in how VoIP can reduce your monthly phone bill, or if the concept of VoIP simply intrigues you, this book is for you.

Implementing Cisco Unified Communications Voice over IP and QoS (CVOICE) Foundation Learning Guide Foundation Learning for the CCNP(R) Voice (CVOICE) 642-437 Exam Kevin Wallace, CCIE(R) No. 7945 Implementing Cisco Unified Communications Voice over IP and QoS (CVOICE) Foundation Learning Guide is a Cisco(R)-authorized, self-paced learning tool for CCNP Voice foundation learning. Developed in conjunction with the Cisco CCNP Voice certification team, it covers all aspects of planning, designing, and deploying Cisco VoIP networks and integrating gateways, gatekeepers, and QoS into them.§§Updated throughout for the new CCNP Voice (CVOICE) Version 8.0 exam (642-437), this guide teaches you how to implement and operate gateways, gatekeepers, Cisco Unified Border Element, Cisco Unified Communications Manager Express, and QoS in a voice network architecture. Coverage includes voice gateways, characteristics of VoIP call legs, dial plans and their implementation, basic implementation of IP phones in Cisco Unified Communications Manager Express environment, and essential information about gatekeepers and Cisco Unified Border Element. The book also provides information on voice-related QoS mechanisms that are required in Cisco Unified Communications networks.§§Fourteen video lab demonstrations on the accompanying CD-ROM walk you step by step through configuring DHCP servers, CUCME autoregistration, ISDN PRI circuits, PSTN dial plans, DID, H.323 and MGCP gateways, VoIP dial peering, gatekeepers, COR, AutoQoS VoIP, and much more. Whether you are preparing for CCNP Voice certification or simply want to gain a better understanding of VoIP and QoS, you will benefit from the foundation information presented in this book. - Voice gateways, including operational modes, functions, related call leg types, and routing techniques - Gateway connections to traditional voice circuits via analog and digital interfaces - Basic VoIP configuration, including A/D conversion, encoding, packetization, gateway protocols, dial peers, and transmission of DTMF, fax, and modem tones - Supporting Cisco IP Phones with Cisco Unified Communications Manager Express - Dial plans, including digit manipulation, path selection, calling privileges, and more - Gatekeepers, Cisco Unified Border Elements, and call admission control (CAC) configuration - QoS issues and mechanisms - Unique DiffServ QoS characteristics and mechanisms - Cisco AutoQoS configuration and operation Companion CD-ROM The CD-ROM that accompanies this book contains 14 video lab demonstrations running approximately 90 minutes.§§This book is in the Foundation Learning Guide Series. These guides are developed together with Cisco(R) as the only authorized, self-paced learning tools that help networking professionals build their understanding of networking concepts and prepare for Cisco certification exams.

Part of the "Certification Self-Study Series", this book is a self-paced learning tool for Cisco Certified Voice Professional (CCVP) voice over IP (VoIP) foundation learning. It aims to provide you with the knowledge you need to implement and support data and voice integration solutions at the network-access level.

The requirements for good quality VoIP communications are difficult to achieve in a time-varying environment due to channel errors and traffic congestion and across different systems. The provision of VoIP in wireless heterogeneous networks requires a set of time-efficient control mechanisms to support a VoIP session with acceptable quality. The focus of Voice over IP in Wireless Heterogeneous Networks is on mechanisms that affect the VoIP user satisfaction while not explicitly involved in the media session. This relates to the extra delays introduced by the security and the signaling protocols used to set up an authorized VoIP session and to the disruption caused by the user mobility during the session. Voice over IP in Wireless Heterogeneous Networks thus investigates and proposes cross-layer techniques for realizing time-efficient control mechanisms for VoIP: signaling, mobility and security.

Seminar paper from the year 2005 in the subject Computer Science - Commercial Information Technology, grade: A (1,3), University of Auckland (Facultiy of Computing), course: Network and Protocols, 10 entries in the bibliography, language: English, abstract: Voice over IP (VoIP) is at the moment one of the most discussed topics in the current network scene. Besides the theoretical interest in network development, there is always the practical relevance which is of high importance for advances in network technology. One major proof, that VoIP research and its technology has a high impact on businesses is the fact that VoIP it is already implemented in a number of companies in the United States of America, UK, Ireland and South Korea, according to Cherry (2005). The following graphic shows the importance of VoIP for companies according to a recent international study conducted by Network Computing.

Die Performance von Voice over IP im Mobilfunk wurde §sowohl theoretisch als auch praktisch schon vielfach §untersucht. Jedoch basierten die Bedingungen für die §Untersuchungen stets auf einer stationären Nutzung. §Die Frage nach der mobilen Nutzung von VoIP steht §aber noch offen. §Welchen Einfluss haben Zellwechselprozesse auf die §Dienstgüte von VoIP? Wie wirkt sich die §Teilnehmermobilität auf die Performance von Voice §over IP aus? §Hauptaugenmerk dieser Arbeit richtet sich daher auf §die Zellwechselprozesse in Mobilfunknetzen. Dabei §werden die Systeme GPRS, EDGE, UMTS, HSDPA und WLAN §untersucht. Im Mittelpunkt steht dabei die von einem §Nutzer wahrnehmbare Dienstgüte von Voice over IP.§Ausgehend von einer theoretischen Betrachtung werden §praktische Untersuchungen zu verschiedenen §Mobilitätsszenarien durchgeführt und ausgewertet.§Zudem werden Möglichkeiten zur Optimierung und §Verbesserung aufgezeigt.

Technologia VoIP integruje transmisje głosu i danych. Szybko staje się bardzo ważnym czynnikiem komunikacji sieciowej. Pozwala obniżyć koszty operacyjne, daje większą elastyczność działania, pozwala na korzystanie z wielu rozszerzających aplikacji. Książka przedstawia wyczerpujący opis tej nowej technologii, aby dopomóc specjalistom z zakresu telefonii i przetwarzania danych w planowaniu i organizacji nowych sieci. Publikacja prezentuje budowę i działanie nowoczesnej infrastruktury telefonicznej, zasadnicze koncepcje dotyczące danych i głosu w sieci, transmisję głosu jako danych oraz protokoły sygnalizacyjne IP używane w sieciach we współpracy z dzisiejszymi systemami telefonicznymi. Autorzy omawiają różne zalety i aplikacje VoIP i pokazują jak zapewnić w sieci dobrą jakość głosu.

A systematic approach to understanding the basics of voice over IP * Understand the basics of enterprise and public telephony networking, IP networking, and how voice is transported over IP networks * Learn the various caveats of converging voice and data networks * Examine the basic VoIP signaling protocols (H.323, MGCP/H.248, SIP) and primary legacy voice signaling protocols (ISDN, C7/SS7) * Explore how VoIP can run the same applications as the existing telephony system but in a more cost-efficient and scalable manner * Delve into such VoIP topics as jitter, latency, packet loss, codecs, QoS tools, and security Voice over IP (VoIP) has become an important factor in network communications, promising lower operational costs, greater flexibility, and a variety of enhanced applications. To help you understand VoIP networks, Voice over IP Fundamentals provides a thorough introduction to the basics of VoIP. Voice over IP Fundamentals explains how a basic IP telephony infrastructure is built and works today, major concepts concerning voice and data networking, and transmission of voice over data networks.You'll learn how voice is signaled through legacy telephone networks, how IP signaling protocols are used to interoperate with current telephony systems, and how to ensure good voice quality using quality of service (QoS). Even though Voice over IP Fundamentals is written for anyone seeking to understand how to use IP to transport voice, its target audience comprises both voice and data networking professionals. In the past, professionals working in voice and data networking did not have to understand each other's roles. However, in this world of time-division multiplexing (TDM) and IP convergence, it is important to understand how these technologies work together. Voice over IP Fundamentals explains all the details so that voice experts can understand data networking and data experts can understand voice networking. The second edition of this best-selling book includes new chapters on the importance of billing and mediation in a VoIP network, security, and the common types of threats inherent when packet voice environments, public switched telephone networks (PSTN), and VoIP interoperate. It also explains enterprise and service-provider applications and services.

Voice Over IP Security Examines The Current State Of Affairs On VoIP Security Through A Survey Of 221 Known/disclosed Security Vulnerabilities In Bug-tracking Databases. The Text Also Identifies Current Areas Of Risk And Deficiencies In The Research.

Widespread broadband deployment has resulted in the evolution of user requirements and a more competitive market. While this is beneficial for consumers, it means that Internet Service Providers must offer a more diverse range of services to generate new revenue streams and strengthen their competitive advantage. Many providers are looking to Service Oriented Architectures, enabling services such as Voice over IP along with other multimedia communications to be easily integrated and managed within their core networks. However these platforms can be cost prohibitive and are typically only employed by larger telecommunications incumbents. This book describes a service oriented communication platform including a lightweight VoIP infrastructure and configurable telephony services. A measurement scheme is also described to provide VoIP QoS estimations across best effort IP networks. This book should be especially useful for any I.T professional interested in deploying fast and inexpensive VoIP services or anyone interested in implementing such services using only open source components.