IP Telephony: Deploying VoIP Protocols and IMS Infrastructure, Second Edition provides a comprehensive practical overview of the technology behind Internet Telephony, giving essential information to Network Engineers, Designers and Managers who need to understand the protocols 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 (Internet Protocol) and networking, it addresses the technical aspects of real-time applications over IP. Drawing on their extensive research and practical development experience in VoIP from its earliest stages, the authors provide an accessible reference to all the relevant standards and cutting-edge techniques in a single resource.

Olivier Hersent founded NetCentrex, a leading provider of VoIP infrastructure for service providers, then became CTO of Comverse after the acquisition of NetCentrex. He now manages Actility, provider of IMS based M2M and smartgrid infrastructure and applications.

Abbreviations	p. ix
Glossary	p. xxi
Preface	p. xxix
Multimedia Over Packet	p. 1
Transporting voice, fax, and video over a packet network	p. 1
A Darwinian view of voice transport	p. 1
Voice and video over IP with RTP and RTCP	p. 5
Encoding media streams	p. 16
Codecs	p. 16
DTMF	p. 39
Fax	p. 40
H.323: Packet-based Multimedia Communications Systems	p. 49
Introduction	p. 49
Understanding H.323	p. 50
Development of the standard	p. 52
Relation between H.323 and H.245 versions, H.323 annexes, and related specifications	p. 55
Where to find the documentation	p. 57
H.323 step by step	p. 58
The 'hello world case': simple voice call from terminal A to terminal B	p. 58
A more complex case: calling a public phone from the Internet using a gatekeeper	p. 72
The gatekeeper-routed model	p. 79
H.323 calls across multiple zones or administrative domains	p. 86
Optimizing and enhancing H.323	p. 95
Issues in H.323v1	p. 95
The 'early H.245' procedure	p. 99
The 'fast-connect' procedure	p. 99
H.245 tunneling	p. 103
Reverting to normal operation	p. 106
Using RAS properly and only when required	p. 106
Conferencing with H.323	p. 108
The MCU conference bridge, MC and MP subsystems	p. 108
Creating or joining a conference	p. 109
H.332	p. 113
Directories and numbering	p. 114
Introduction	p. 114
Contacting an email alias with H.323 and the DNS	p. 115
E164 numbers and IP telephony	p. 116
H.323 security	p. 124
Typical deployment cases	p. 124
H.235	p. 131
Supplementary services	p. 148
Supplementary services using H.450	p. 148
Proper use of H.450 supplementary services, future directions for implementation of supplementary services	p. 154
Future work on H.323	p. 155
The Session Initiation Protocol (SIP)	p. 159
The origin and purpose of SIP	p. 159
From RFC 2543 to RFC 3261	p. 163
From RFC 3261 to 3GPP, 3GPP2 and TISPAN	p. 166
Overview of a simple SIP call	p. 167
Basic call scenario	p. 167
Syntax of SIP messages	p. 169
Call handling services with SIP	p. 219
Location and registration	p. 220
The proxy function, back to back user agents	p. 230
Some common services	p. 242
Multiparty conferencing	p. 244
SIP security	p. 250
Media security	p. 250
Message exchange security	p. 251
Instant messaging (IM) and presence	p. 254
Common profile for instant messaging (CPIM)	p. 255
RFC 3265, Specific Event Notification	p. 260
RFC 3428: SIP extensions for instant messaging	p. 266
The 3GPP IP Multimedia Subsystem (IMS) Architecture	p. 269
Introduction	p. 269
Centralized value added services platforms on Switched telephone networks: the 'tromboning' issue	p. 269
The 'Intelligent Network' (IN)	p. 270
How VoIP solves the 'tromboning' issue. The value added services architecture of 3GPP IMS	p. 270
The IMS architecture is ideal for mobile Networks … but not only	p. 273
Overview of the IMS architecture	p. 274
Registration	p. 274
SIP session establishment in an IMS environment	p. 275
A few remarks on the IMS architecture	p. 278
The IMS CSCFs	p. 279
The Proxy-CSCF	p. 279
The Serving-CSCF (S-CSCF) and Application Servers (AS)	p. 282
The Media Resource Function (MRF)	p. 286
The full picture: 3GPP release 8, TISPAN	p. 288
The packet core domain: the evolved packet system	p. 289
The IMS domain	p. 299
Summary of SIP extensions required in an IMS network	p. 311
The Media Gateway to Media Controller Protocol (MGCP)	p. 313
Introduction: why MGCP?	p. 313
Stimulus protocols	p. 313
Decomposed gateways	p. 315
Some history	p. 317
MGCP 1.0	p. 318
The MGCP connection model	p. 321
The protocol	p. 323
Handling of fax	p. 350
Extensions for phone user interface control	p. 354
Sample MGCP call flows	p. 358
Call set-up	p. 358
DTMF tones	p. 364
Call release	p. 364
The future of MGCP	p. 365
Advanced Topics: Call Redirection	p. 367
Call redirection in VoIP networks	p. 367
Call transfer, call forward, call deflection	p. 367
Summary of major issues	p. 368
Reference network configurations in the PSTN	p. 371
Reference network configurations with VoIP	p. 374
How to signal call transfer?	p. 387
VoIP call redirection and call routing	p. 388
Conclusion	p. 390
Advanced Topics: NAT Traversal	p. 393
Introduction to Network Address Translation	p. 393
One-to-one NAT	p. 393
NAPT	p. 394
Issues with NAT and NAPT	p. 396
Workarounds for VoIP when the network cannot be controlled	p. 398
Ringing the proper phone	p. 398
Using port forwarding to solve the wrong media address problem	p. 399
STUN	p. 399
Other proposals: COMEDIA and TURN	p. 402
Recommended network design for service providers	p. 404
Avoid NAT in the customer premises for VoIP	p. 405
Media proxies	p. 412
Security considerations	p. 415
Conclusion	p. 416
Annex	p. 417
Index	p. 427
Table of Contents provided by Ingram. All Rights Reserved.

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