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IP Telephony Olivier Hersent

IP Telephony von Olivier Hersent

IP Telephony Olivier Hersent

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Zusammenfassung

Internet Telephony is a technology which provides a cheaper alternative to phone networks at the end of the 20th century. This text is a practical, technical overview of the technology behind Internet Telephony, providing information for IT professionals.

IP Telephony Zusammenfassung

IP Telephony Olivier Hersent

This book provides a comprehensive practical overview of the technology behind Internet Telephony, giving essential information to IT professionals who need to understand the background and explore the issues involved in migrating the existing telephony infrastructure to an IP based real time communication service. Assuming a working knowledge of IP and ISDN networking, it addresses the technical aspects of real-time applications over IP, with an in-depth coverage of voice and video applications and protocols. Drawing on their extensive research and practical development experience in VoIP from its earliest stages, the authors give you access to all the relevant standards and cutting-edge techniques in a single resource.

Über Olivier Hersent

The author is an experienced professional working for CNET/FranceTelecom, where he has been one of the pioneers of the technology, and has been involved with one of the first commercial implementations of an IP Telephony. He also sits on the Voice over IP standards bodies.

Inhaltsverzeichnis

Foreword Jeff Pulver Preface SECTION 1 The application layer, IP telephony protocols H.323 and a general background on IP telephony A little history Where to find documentation From RTP to H.323: a quick tour Transporting voice over a packet network A Darwinian view of voice transport Voice and video over IP with RTP and RTCP H.323 step by step The "hello world" case: simple voice call from terminal A to terminal B A more complex case: calling a public phone from the Internet H.323 across multiple domains Advanced topics Faster procedures Conferencing with H.323 Directories and numbering H.323 security: H.235 Media streams Codecs DTMF Fax Supplementary services using H.450 H.450.1 H.450.2: call transfer H.450.3: call diversion The future of H.450 Future work on H.323 The session initiation protocol (SIP) The origin and purpose of SIP Overview of a simple SIP call SIP messages Session description syntax, SDP Advanced services with SIP SIP entities User location and mobility Multiparty conferencing Configuring network-based call handling Billing SIP calls SIP security Media security SIP firewalls SIP and H.323 What SIP does and H.323 does not What H.323 does and SIP does not H.323 to SIP gateways Conclusion on the future of SIP and its relation to H.323 Media gateway to media controller protocols (MGCP) Introduction Which protocol? What about the requirements? A new architecture for IP telephony? What is MGCP? MGCP commands Protocols at work Scenario 1 Scenario 2 The H.323 case SECTION 2 Voice technology background Voice quality Introduction Reference connection Echo in a telephone network Talker echo, listener echo Hybrid echo Acoustic echo How to limit echo Delay in a telephone network Influence of the operating system Influence of the jitter buffer policy on delay Influence of the codec, frame grouping and redundancy Consequence for measuring end-to-end delay Acceptability of a phone call with echo and delay Consequences for an IP telephony network The approach of ETSI TIPHON Other requirements for gateways and transcoding equipment Voice coding Introduction Transmitted bandwidth, sampling and quantization Some basic tools for digital signal processing The A or u law ITU-T 64 kbit/s G.711 Specifications and subjective quality of speech coders ACR subjective test or what is the MOS Speech and auditory properties Speech production Auditory perception used for speech and audio bitrate reduction Quantization and coders Adaptive quantizers Differential (and predictive) quantization Vector quantization Entropy coding Waveform coders: the ADPCM ITU-T G.726 Wideband speech coding using waveform-type coder Speech coding techniques Hybrids and analysis by synthesis speech coders The GSM Full Rate RPE-LTP speech coder Codebook excited linear predictive (CELP) coders The ITU-T 8 kbit/s CS-ACELP G.729 The ITU-T G.723.1 Discont

Zusätzliche Informationen

GOR002885630
9780201619102
0201619105
IP Telephony Olivier Hersent
Olivier Hersent
Gebraucht - Sehr Gut
Broschiert
Pearson Education Limited
2000-01-06
480
N/A
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