Packet Guide to Voice Over IP

Packet Guide to Voice Over IP
Author: Bruce Hartpence
Publisher:
Total Pages:
Release: 2013
Genre: Electronic books
ISBN: 9781449339661
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Go under the hood of an operating Voice over IP network, and build your knowledge of the protocols and architectures used by this Internet telephony technology. With this concise guide, you{u2019}ll learn about services involved in VoIP and get a first-hand view of network data packets from the time the phones boot through calls and subsequent connection teardown. With packet captures available on the companion website, this book is ideal whether you{u2019}re an instructor, student, or professional looking to boost your skill set. Each chapter includes a set of review questions, as well as practical, hands-on lab exercises. Learn the requirements for deploying packetized voice and video Understand traditional telephony concepts, including local loop, tip and ring, and T carriers Explore the Session Initiation Protocol (SIP), VoIP{u2019}s primary signaling protocol Learn the operations and fields for VoIP{u2019}s standardized RTP and RTCP transport protocols Delve into voice and video codecs for converting analog data to digital format for transmission Get familiar with Communications Systems H.323, SIP{u2019}s widely used predecessor Examine the Skinny Client Control Protocol used in Cisco VoIP phones in networks around the world.

Voice Packetization, Codecs and Voice Quality

Voice Packetization, Codecs and Voice Quality
Author: Eric Coll
Publisher: Teracom Training Institute
Total Pages: 68
Release: 2023-02-09
Genre: Technology & Engineering
ISBN: 1988138248
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Voice Packetization, Codecs and Voice Quality The "nuts and bolts" of Voice over IP: • How voice is digitized and coded, • Time stamps applied with the RTP protocol, and • How the result is carried in UDP, IP packets and MAC frames. You'll learn about codecs and compression, and understand factors like delay, jitter and packet loss, what causes them, and how they affect sound quality. VoIP Module 4 Detailed Outline 4. Voice Packetization, Codecs and Voice Quality 4.1 Voice Packetization ...... 4.1.1 Microphone Produces a Voltage Analog ...... 4.1.2 Digitization ...... 4.1.3 Coding ...... 4.1.4 Segmentation and Packetization 4.2 Measuring Voice Quality ...... 4.2.1 Mean Opinion Score ...... 4.2.2 Toll-Quality Speech 4.3 Factors Affecting Voice Quality ...... 4.3.1 Codec, Delay, Jitter and Packet Loss ...... 4.3.2 Network Load 4.4 Codecs and Compression ...... 4.4.1 Coder / Decoder ...... 4.4.2 Tradeoffs ...... 4.4.3 CBR vs. VBR ...... 4.4.4 Standards 4.5 Delay ...... 4.5.1 Coding Delay ...... 4.5.2 Network Delay ...... 4.5.3 Design Goal 4.6 Jitter ...... 4.6.1 IP: No Guarantees ...... 4.6.2 Variable Delivery Time ...... 4.6.3 Variable Network Loading ...... 4.6.4 Jitter Buffer 4.7 RTP ...... 4.7.1 Real-Time Transport Protocol ...... 4.7.2 Segmentation ...... 4.7.3 Time Stamp ...... 4.7.4 Error Recovery 4.8 VoIP Protocol Stack: RTP, UDP, IP, MAC ...... 4.8.1 Moving the RTP PDU ...... 4.8.2 UDP Error Detection and Recovery ...... 4.8.3 Port Number ...... 4.8.4 RTP/UDP/IP/Ethernet Protocol Stack ...... 4.8.5 Header Compression 4.9 Packet Loss ...... 4.9.1 Packet Loss Mechanism ...... 4.9.2 Recovery 4.10 Tips for Maximizing Voice Quality ...... 4.10.1 Network Level Testing ...... 4.10.2 VoIP Application Level Testing ...... 4.10.3 Strategies

Implementing Voice over IP

Implementing Voice over IP
Author: Bhumip Khasnabish
Publisher: John Wiley & Sons
Total Pages: 226
Release: 2003-08-01
Genre: Technology & Engineering
ISBN: 0471460885
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Im Mittelpunkt der Diskussion stehen hier existierende und neue Technologien für die Vermittlung von Sprachverkehr über das Internet Protocol (IP). - bis vor kurzem stammte der Datenverkehr über Kommunikationsnetzwerke größtenteils aus herkömmlich vermittelten Telefonverbindungen - zukünftig wird dieser Sprachverkehr durch ein riesiges Volumen paketvermittelter Daten (Text- und Audiodateien, Streaming Video usw.) weit in den Schatten gestellt; Telefongespräche werden dann über Internetprotokolle vermittelt - hier erhalten Sie eine detaillierte Einführung in den Aufbau eines effizienten VoIP-Netzwerkes - erläutert Prototyping und Leistungsmessung in solchen Netzwerken - besprochen werden auch Aspekte des Quality-of-Service (QoS)

Voice Over Frame Relay

Voice Over Frame Relay
Author: William Flanagan
Publisher: CRC Press
Total Pages: 242
Release: 1997-01-11
Genre: Computers
ISBN: 1482280612
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Voice Over Frame Relay - the next practical way to reduce your network costs! Savings from putting voice tie lines on frame relay data networks can pay back the additional investment in voice equipment in just months. Savings on international circuits are large enough to threaten present tariff structures (with some help from the FCC). From being '

Packet Guide to Voice over IP

Packet Guide to Voice over IP
Author: Bruce Hartpence
Publisher: "O'Reilly Media, Inc."
Total Pages: 243
Release: 2013-02-26
Genre: Computers
ISBN: 1449339638
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Go under the hood of an operating Voice over IP network, and build your knowledge of the protocols and architectures used by this Internet telephony technology. With this concise guide, you’ll learn about services involved in VoIP and get a first-hand view of network data packets from the time the phones boot through calls and subsequent connection teardown. With packet captures available on the companion website, this book is ideal whether you’re an instructor, student, or professional looking to boost your skill set. Each chapter includes a set of review questions, as well as practical, hands-on lab exercises. Learn the requirements for deploying packetized voice and video Understand traditional telephony concepts, including local loop, tip and ring, and T carriers Explore the Session Initiation Protocol (SIP), VoIP’s primary signaling protocol Learn the operations and fields for VoIP’s standardized RTP and RTCP transport protocols Delve into voice and video codecs for converting analog data to digital format for transmission Get familiar with Communications Systems H.323, SIP’s widely used predecessor Examine the Skinny Client Control Protocol used in Cisco VoIP phones in networks around the world

The Practical Handbook of Internet Computing

The Practical Handbook of Internet Computing
Author: Munindar P. Singh
Publisher: CRC Press
Total Pages: 1399
Release: 2004-09-29
Genre: Computers
ISBN: 1135439699
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The Practical Handbook of Internet Computing analyzes a broad array of technologies and concerns related to the Internet, including corporate intranets. Fresh and insightful articles by recognized experts address the key challenges facing Internet users, designers, integrators, and policymakers. In addition to discussing major applications, it also covers the architectures, enabling technologies, software utilities, and engineering techniques that are necessary to conduct distributed computing and take advantage of Web-based services. The Handbook provides practical advice based upon experience, standards, and theory. It examines all aspects of Internet computing in wide-area and enterprise settings, ranging from innovative applications to systems and utilities, enabling technologies, and engineering and management. Content includes articles that explore the components that make Internet computing work, including storage, servers, and other systems and utilities. Additional articles examine the technologies and structures that support the Internet, such as directory services, agents, and policies. The volume also discusses the multidimensional aspects of Internet applications, including mobility, collaboration, and pervasive computing. It concludes with an examination of the Internet as a holistic entity, with considerations of privacy and law combined with technical content.

Voice and Data Networking

Voice and Data Networking
Author: Gilbert Held
Publisher:
Total Pages: 372
Release: 2000
Genre: Computer networks
ISBN: 9780072124293
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Voice Over MPLS

Voice Over MPLS
Author: Daniel Minoli
Publisher: McGraw Hill Professional
Total Pages: 466
Release: 2002-05-23
Genre: Technology & Engineering
ISBN: 007150110X
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MPLS is many things to many people. If you’re moving IP voice traffic, it may mean performance gains for you. Daniel Minoli’s Voice Over MPLS gives you the technical and business lowdown on innovative new solutions for packet-based voice. What does it take to build flexible, high-performance networks with enhanced quality of service? Maybe not as much as you think. RELIABLE VOICE SERVICES THAT CUSTOMERS CAN AFFORD With VoMPLS, you can deliver the quality associated with VoIP over ATM links without the cost in either bandwidth or equipment. Based on label-switching standards from the IETF and the work of a number of leading companies, Voice over MPLS lets you packetize voice without the added overhead of IP encapsulation. It also suppresses periods of silence, freeing up bandwidth for other uses. From one of the most experienced names in telecom technology, Voice Over MPLS shows you how to— * Provide multiple, high-quality services without costly leased lines * Deliver low-bandwidth voice over ATM, Frame Relay, or IP * Add phone “lines” without adding equipment * Solve scaling issues for small- and medium-sized users * Obtain consistent call quality without crunching bandwidth * Discover ways to protect revenues during deployment * Evaluate the potential role of VoMPLS in big-picture convergence * Evaluate VoMPLS’s impact on public networks Find the engineering details you need for Label Switched Paths (LSPs), layers, signaling, CoS (Classes of Service), QoS (Quality of Service), VoMPLS in VPNs (Virtual Private Networks), implementation options, deployment, and more.

Beyond VoIP Protocols

Beyond VoIP Protocols
Author: Olivier Hersent
Publisher: John Wiley & Sons
Total Pages: 296
Release: 2005-03-04
Genre: Technology & Engineering
ISBN: 9780470023624
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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.