Understanding VoIP: internet telephony and the future voice network

INDICE: 1. IP Technology Disrupts Voice Telephony 1 1.A Introduction to thePublic Switched Telephone Network 1 1.B The Digital PSTN 2 1.C The Packet Revolution in Telephony 7 2. Traditional Telephones Still Set Expectations 16 2.AAvailability: How the Bell System ensured service 16 2.B Call Completion 18 2.C Sound Quality: encoding for recognizable voices 18 2.D Low Latency 20 2.E Call Setup Delays 21 2.F Impairments controlled: echo, singing, distortion, noise 22 3. From Circuits to Packets 25 3.A Data and Signaling Preceded Voice 25 3.B Putting Voice into Packets 27 4. Packet Transmission and Switching 33 4.A The Physical Layer: Transmission 34 4.B Data Link Protocols 36 4.C IP, the Network Protocol 38 4.D Layer 4 Transport Protocols 40 4.E Higher Layer Processes47 4.F Saving Bandwidth 55 4.G Differences: Circuit vs. Packet Switched 61 5.VoIP Signaling and Call Processing 67 5.A What packet voice and UC systems share 67 5.B Session Initiation Protocol (SIP) 69 5.C Session Description Protocol 91 5.D Media Gateway Control Protocol 95 5.E H. 323 108 5.F Directory services 120 6. VoIP and Unified Communications Define the Future 123 6.A Voice As Before, with Additions 123 6.B Legacy Services to Keep and Improve with VoIP 123 6.C Facsimile transmission 134 6.D Phone Features Added with VoIP/UC 143 7.How VoIP and UC Features to Consider 149 7.A Space, Power, and Cooling 150 7.B Priority for voice, Video, Fax Pakets 150 7.C Packets per Second 152 7.D Bandwidth 152 7.E Security Issues 153 7.F First Migration Steps While Keeping Legacy Equipment 159 8. Interconnections to Global Services 163 8.A Media Gateways 163 8.B SIP Trunking 166 8.C Operating VoIP Across Network Address Translation 170 8.D Session Border Controller 179 8.E Supporting multiple carrier connections 183 8.F Mobility and Wireless Access 184 9. Network Management for VoIPand UC 188 9.A Starting Right 189 9.B Continuous Monitoring and Management 191 9.C Troubleshooting and Repair 195 10. Cost Analysis and Payback Calculation199 11. Examples of Hardware and Software203 11.A IP Phones 203 11.B Gateways206 11.C Session Border Controllers 209 11.D Call Switching Servers 209 11.E Hosted VoIP/UC Service. 11.F Management Systems/Workstations 215 12. Appendices 217 12.A Acronyms and Definitions 217 12.B Reference Documents 226 12.C Message and Error Codes 233 13. Index 236

• ISBN: 978-1-118-01921-4
• Editorial: John Wiley & Sons
• Encuadernacion: Rústica
• Páginas: 300
• Fecha Publicación: 09/03/2012
• Nº Volúmenes: 1
• Idioma: Inglés