VoIP and unified communications: internet telephony and the future voice network
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Buch |
| Sprache: | English |
| Veröffentlicht: |
Hoboken, N.J.
Wiley
2012
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| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | XV, 298 S. Ill., graph. Darst. |
| ISBN: | 9781118019214 |
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Datensatz im Suchindex
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|---|---|
| adam_text | Titel: VoIP and unified communications
Autor: Flanagan, William A
Jahr: 2012
CONTENTS
Preface xiii
Acknowledgments 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
vii
riii CONTENTS
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 (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
CONTENTS
5.4.2 MGW Connection Model / 11C
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) /
5.6.2 ENUM / 135
IX
134
6 VoIP and Unified Communications Define the Future 139
6.1 Voice as Before, with Additions / 139
6.2 Legacy Services to Keep and Improve with VoIP / 140
6.2.1 Flexible Call Routing and 800 Numbers / 141
6.2.2 Call on Hold / 141
6.2.3 Call Transfer / 142
6.2.4 Call Forwarding / 142
6.2.5 Audio Conferencing / 142
6.2.6 Video Conferencing / 143
6.2.7 Local Number Portability / 144
6.2.8 Direct Inward Dialing, Dialed Number
Indication / 144
6.2.9 Call/Message Waiting / 145
6.2.10 Call Recording / 146
6.2.11 Emergency Calling (E911) / 146
6.2.12 Tracking IP Phone Locations for E911 / 150
6.3 Facsimile Transmission / 153
6.3.1 Facsimile on the PSTN 153
6.3.2 Real-Time Fax over IP: Fax Relay
orT.38 / 155
6.3.3 Store-and-Forward Fax Handling 160
6.3.4 IP Faxing over the PSTN / 161
6.4 Phone Features Added with VoIP/UC / 162
6.4.1 Presence / 163
6.4.2 Forking / 163
6.4.3 Voicemail = eMail / 163
6.4.4 SMS Integration / 164
CONTENTS
6.4.5 Instant Messaging / 165
6.4.6 Webinar Broadcasts / 168
6.4.7 Telepresence / 168
6.4.8 More UC Features to Consider / 168
7 How VoIP and UC Impact the Network 171
7.1 Space, Power, and Cooling / 171
7.2 Priority for Voice, Video, Fax Packets / 172
7.3 Packets per Second / 174
7.4 Bandwidth / 174
7.5 Security Issues / 175
7.5.1 Eavesdropping and vLAN Hopping / 176
7.5.2 Access Controls for Users and Connections / 176
7.5.3 Modems / 177
7.5.4 DNS Cache Poisoning / 177
IN SHORT: Earliest Instance of DNS Cache
Poisoning / 179
7.5.5 Toll Fraud / 179
7.5.6 Pay-per-Call Scams / 179
7.5.7 Vishing / 180
7.5.8 SIP Scanning/SPIT / 180
7.5.9 Opening the Firewall to Incoming Voice / 181
7.6 First Migration Steps While Keeping Legacy
Equipment 181
7.6.1 Circuit-Switched PBX / 182
7.6.2 Digital Phones / 182
7.6.3 Analog Phones and FX Service / 183
7.6.4 Facsimile Machines / 184
7.6.5 Modems / 185
8 Interconnections to Global Services 187
8.1 Media Gateways / 188
8.2 SIP Trunking 192
8.3 Operating VoIP Across Network Address Translation / 196
8.3.1 Failures of SIP, SDP (Signaling) / 199
8.3.2 Failures of RTP (Media) / 199
8.3.3 Solutions / 200
8.3.4 STUN: Session Traversal Utilities for NAT / 201
8.3.5 TURN: Traversal Using Relays around NAT / 204
8.3.6 ICE: Interactive Connectivity Establishment / 206
8.4 Session Border Controller / 207
8.4.1 Enterprise SBC / 209
8.4.2 Carrier SBC / 210
CONTENTS Xi
8.5 Supporting Multiple-Carrier Connections / 212
8.6 Mobility and Wireless Access / 213
8.6.1 VoIP on Wireless LANs/Wi-Fi / 213
8.6.2 Integration of Wi-Fi and Cellular
Services / 214
8.6.3 Packet Voice on Mobile Broadband: WiMAX,
LTE / 214
8.6.4 Radio over VoIP / 215
IN SHORT: E M Voice Signaling / 216
9 Network Management for VoIP and UC 217
9.1 Starting Right / 218
9.1.1 Acceptance Testing 219
9.1.2 Configuration Management and Governance / 220
9.1.3 Privilege Setting / 220
9.2 Continuous Monitoring and Management / 221
9.2.1 NMS Software / 222
9.2.2 Simple Network Management Protocol / 223
9.2.3 Web Interface / 224
9.2.4 Server Logging 224
9.2.5 Software Maintenance 225
9.2.6 Quality of Service Experience Monitoring 225
9.2.7 Validate Adjustments and Optimization 226
9.3 Troubleshooting and Repair 226
9.3.1 Methods 226
9.3.2 Software Tools 228
9.3.3 Test Instruments 229
10 Cost Analysis and Payback Calculation 231
11 Examples of Hardware and Software 237
11.1 IP Phones 237
11.2 Gateways 240
11.3 Session Border Controllers 242
11.4 Call-Switching Servers 244
11.4.1 IPPBX 246
11.4.2 Conference Bridges/Controllers 248
11.4.3 Call Recorder / 250
11.5 Hosted VoIP/UC Service / 251
11.6 Management Systems/Workstations / 252
Xii CONTENTS
12 Appendixes 253
12.1 Acronyms and Definitions / 253
12.2 Reference Documents / 268
12.2.1 RFCs / 268
12.2.2 ITU Recommendations / 272
12.2.3 Other Sources / 272
12.3 Message and Error Codes / 274
Index 277
|
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| title | VoIP and unified communications internet telephony and the future voice network |
| title_auth | VoIP and unified communications internet telephony and the future voice network |
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| title_full | VoIP and unified communications internet telephony and the future voice network William A. Flanagan |
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| title_short | VoIP and unified communications |
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