By Olivier Hersent(auth.)
All you must find out about deploying VoIP protocols in a single accomplished and hugely sensible reference - Now up to date with insurance on SIP and the IMS infrastructure
This ebook presents a accomplished and useful review of the know-how in the back of web Telephony (IP), supplying crucial details to community Engineers, Designers, and bosses who have to comprehend the protocols. moreover, the writer explores the problems occupied with the migration of present telephony infrastructure to an IP - dependent genuine time conversation provider. Assuming a operating wisdom of IP and networking, it addresses the technical points of real-time functions over IP. Drawing on his huge examine and useful improvement adventure in VoIP from its earliest levels, the writer presents an obtainable connection with the entire proper criteria and state-of-the-art ideas in one resource.
- Updated with a bankruptcy on SIP and the IMS infrastructure
- Covers the entire significant VoIP protocols – SIP, H323 and MGCP
- Includes a wide part on useful deployment matters gleaned from the authors’ personal event
- Chapter at the intent for IP telephony and outline of the technical and company drivers for transitioning to all IP networks
This booklet may be a priceless advisor for pro community engineers, designers and executives, choice makers and venture managers overseeing VoIP implementations, industry analysts, and specialists. complicated undergraduate and graduate scholars venture data/voice/multimedia communications classes also will locate this e-book of interest.
Olivier Hersent based NetCentrex, a number one supplier of VoIP infrastructure for carrier services, then turned CTO of Comverse after the purchase of NetCentrex. He now manages Actility, supplier of IMS established M2M and smartgrid infrastructure and applications.
Chapter 1 Multimedia over Packet (pages 1–48):
Chapter 2 H.323: Packet?Based Multimedia Communications structures (pages 49–157):
Chapter three The consultation Initiation Protocol (SIP) (pages 159–268):
Chapter four The 3GPP IP Multimedia Subsystem (IMS) structure (pages 269–311):
Chapter five The Media Gateway to Media Controller Protocol (MGCP) (pages 313–366):
Chapter 6 complicated subject matters: name Redirection (pages 367–391):
Chapter 7 complex issues: NAT Traversal (pages 393–416):
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Extra resources for IP Telephony, Second Edition
Media streams in the same session should share a common RTCP channel. 323 or SIP require applications to define explicitly a port for each media channel. 323 or SIP, even if it does not follow the RTP RFC guidelines. 323 or SIP applications. • Synchronization source (SSRC): identifies the source of an RTP stream, identified by 32 bits in the RTP header. All RTP packets with a common SSRC have a common time and sequencing reference. Each sender needs to have an SSRC; each receiver also needs at least one SSRC as this information is used for receiver reports (RRs).
APP: functions specific to an application. Several RTCP messages can be packed in a single transport protocol packet. Each RTCP message contains enough length information to be properly decoded if several of those RTCP messages are packed in a single UDP packet. This packing can be useful to save overhead bandwidth used by the transport protocol header. 9. 9 RTCP packet format. 12 IP TELEPHONY The first section contains: • The 5-bit reception report count (RC), which is the number of report blocks included in this SR.
It is also inexpensive when there are relatively few users talking at the same time and when they are not too far apart. But the most basic analogue technology requires one pair of wires per active conversation, which becomes rapidly unpractical and expensive. The first improvement to the basic ‘baseband’ analog technology involved multiplexing several conversations on the same wire, using a separate transport frequency for each signal. But even with this hack, analog telephony has many drawbacks: • Unless you use manual switchboards, analog switches require a lot of electromechanical gear, which is expensive to buy and maintain.
IP Telephony, Second Edition by Olivier Hersent(auth.)