VoIP and Unified Communications
Internet Telephony and the Future Voice Network
(Sprache: Englisch)
Translates technical jargon into practical business communications solutions
This book takes readers from traditional voice, fax, video, and data services delivered via separate platforms to a single, unified platform delivering all of these services...
This book takes readers from traditional voice, fax, video, and data services delivered via separate platforms to a single, unified platform delivering all of these services...
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Translates technical jargon into practical business communications solutionsThis book takes readers from traditional voice, fax, video, and data services delivered via separate platforms to a single, unified platform delivering all of these services seamlessly via the Internet. With its clear, jargon-free explanations, the author enables all readers to better understand and assess the growing number of voice over Internet protocol (VoIP) and unified communications (UC) products and services that are available for businesses.
VoIP and Unified Communications is based on the author's careful review and synthesis of more than 7,000 pages of published standards as well as a broad range of datasheets, websites, white papers, and webinars. It begins with an introduction to IP technology and then covers such topics as:
Packet transmission and switching
VoIP signaling and call processing
How VoIP and UC are defining the future
Interconnections with global services
Network management for VoIP and UC
This book features a complete chapter dedicated to cost analyses and payback calculations, enabling readers to accurately determine the short- and long-term financial impact of migrating to various VoIP and UC products and services. There's also a chapter detailing major IP systems hardware and software. Throughout the book, diagrams illustrate how various VoIP and UC components and systems work. In addition, the author highlights potential problems and threats to UC services, steering readers away from common pitfalls.
Concise and to the point, this text enables readers--from novices to experienced engineers and technical managers--to understand how VoIP and UC really work so that everyone can confidently deal with network engineers, data center gurus, and top management.
Inhaltsverzeichnis zu „VoIP and Unified Communications “
Preface xiiiAcknowledgments xv
1 IP Technology Disrupts Voice Telephony 1
1.1 Introduction to the Public Switched Telephone Network / 1
1.2 The Digital PSTN / 2
1.3 The Packet Revolution in Telephony / 8
1.3.1 Summary of Packet Switching / 9
1.3.2 Link Capacity: TDM versus Packets / 11
1.3.3 VoIP and "The Cloud" / 13
IN SHORT: Reading Network Drawings / 14
2 Traditional Telephones Still Set Expectations 17
2.1 Availability: How the Bell System Ensured Service / 18
2.2 Call Completion / 19
2.3 Sound Quality: Encoding for Recognizable Voices / 20
2.4 Low Latency / 23
2.5 Call Setup Delays / 24
2.6 Impairments Controlled: Echo, Singing, Distortion, Noise / 25
3 From Circuits to Packets 27
3.1 Data and Signaling Preceded Voice / 27
3.1.1 X.25 Packet Data Service / 27
3.1.2 SS7: PSTN Signaling on Packets / 28
3.1.3 ISDN / 29
3.2 Putting Voice into Packets / 30
3.2.1 Voice Encoding / 31
3.2.2 Dicing and Splicing Voice Streams / 32
3.2.3 The Latency Budget / 33
4 Packet Transmission and Switching 37
4.1 The Physical Layer: Transmission / 39
IN SHORT: The Endian Wars / 40
4.2 Data Link Protocols / 41
4.3 IP, the Network Protocol / 43
4.4 Layer 4 Transport Protocols / 47
4.4.1 Transmission Control Protocol / 47
4.4.2 User Datagram Protocol / 50
4.4.3 Stream Control Transmission Protocol / 51
4.5 Higher Layer Processes / 54
4.5.1 RTP / 54
4.5.2 RTCP / 57
4.5.3 Multiplexing RTP and RTCP on One UDP Port / 58
4.5.4 RTP Mixers and Translators / 59
4.5.5 Layered Encoding / 60
4.5.6 Profiles for Audio and Video Conferences / 60
4.5.7 Security via Encryption / 61
IN SHORT: Public Key Infrastructure
... mehr
(PKI) / 62
4.6 Saving Bandwidth / 64
4.6.1 Voice Compression / 64
4.6.2 Header Compression / 66
4.6.3 Silence Suppression, VAD / 67
4.6.4 Sub-Packet Multiplexing / 69
4.6.5 Protocol and Codec Selection / 70
4.7 Differences: Circuit versus Packet Switched / 71
4.7.1 Power to the Desktop Phone / 71
4.7.2 Phone as Computer and Computer as Phone / 72
4.7.3 Length of a Phone Line / 72
4.7.4 Scaling to Large Size / 75
4.7.5 Software Ownership and Licenses / 75
5 VoIP Signaling and Call Processing 77
5.1 What Packet Voice and UC Systems Share / 78
5.2 Session Initiation Protocol (SIP) / 80
5.2.1 SIP Architecture / 81
5.2.2 SIP Messages / 88
5.2.3 SIP Header Fields and Behaviors / 94
5.3 Session Description Protocol / 101
IN SHORT: ABNF / 104
5.4 Media Gateway Control Protocol / 107
5.4.1 MGW Functions / 107
5.4.2 MGW Connection Model / 110
5.4.3 Megaco Procedures / 112
5.4.4 Megaco Details / 115
5.4.5 Signaling Conversion / 119
5.4.6 Voice Transcoding / 119
5.5 H.323 / 120
5.5.1 H.323 Architecture / 121
5.5.2 Gatekeeper / 123
5.5.3 Gateway / 126
5.5.4 Terminal / 126
5.5.5 Multipoint Control Unit / 127
5.5.6 Call Procedures / 128
5.6 Directory Services / 134
5.6.1 Domain Name Service (DNS) / 134
5.6.2 ENUM / 135
6 VoIP and Unified Communications Define the Future 139
6.1 Voice as Before, with Additions / 139
4.6 Saving Bandwidth / 64
4.6.1 Voice Compression / 64
4.6.2 Header Compression / 66
4.6.3 Silence Suppression, VAD / 67
4.6.4 Sub-Packet Multiplexing / 69
4.6.5 Protocol and Codec Selection / 70
4.7 Differences: Circuit versus Packet Switched / 71
4.7.1 Power to the Desktop Phone / 71
4.7.2 Phone as Computer and Computer as Phone / 72
4.7.3 Length of a Phone Line / 72
4.7.4 Scaling to Large Size / 75
4.7.5 Software Ownership and Licenses / 75
5 VoIP Signaling and Call Processing 77
5.1 What Packet Voice and UC Systems Share / 78
5.2 Session Initiation Protocol (SIP) / 80
5.2.1 SIP Architecture / 81
5.2.2 SIP Messages / 88
5.2.3 SIP Header Fields and Behaviors / 94
5.3 Session Description Protocol / 101
IN SHORT: ABNF / 104
5.4 Media Gateway Control Protocol / 107
5.4.1 MGW Functions / 107
5.4.2 MGW Connection Model / 110
5.4.3 Megaco Procedures / 112
5.4.4 Megaco Details / 115
5.4.5 Signaling Conversion / 119
5.4.6 Voice Transcoding / 119
5.5 H.323 / 120
5.5.1 H.323 Architecture / 121
5.5.2 Gatekeeper / 123
5.5.3 Gateway / 126
5.5.4 Terminal / 126
5.5.5 Multipoint Control Unit / 127
5.5.6 Call Procedures / 128
5.6 Directory Services / 134
5.6.1 Domain Name Service (DNS) / 134
5.6.2 ENUM / 135
6 VoIP and Unified Communications Define the Future 139
6.1 Voice as Before, with Additions / 139
... weniger
Autoren-Porträt von William A. Flanagan
WILLIAM A. FLANAGAN is President and founder of Flanagan Consulting. With three decades of telecommunications experience, Mr. Flanagan is an expert in voice and data technologies, products, markets, and customers. His network designs have solved problems for enterprises, government agencies, and carriers.
Bibliographische Angaben
- Autor: William A. Flanagan
- 2012, 1. Auflage, 300 Seiten, Maße: 15,6 x 23,4 cm, Kartoniert (TB), Englisch
- Verlag: Wiley & Sons
- ISBN-10: 1118019210
- ISBN-13: 9781118019214
- Erscheinungsdatum: 20.04.2012
Sprache:
Englisch
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