IP Telephony, Second Edition by Olivier Hersent(auth.)

By Olivier Hersent(auth.)

All you must learn about deploying VoIP protocols in a single complete and hugely sensible reference - Now up-to-date with assurance on SIP and the IMS infrastructure

This publication offers a entire and sensible evaluate of the know-how in the back of net Telephony (IP), supplying crucial info to community Engineers, Designers, and executives who have to comprehend the protocols. in addition, the writer explores the problems keen on the migration of present telephony infrastructure to an IP - established genuine time conversation provider. Assuming a operating wisdom of IP and networking, it addresses the technical features of real-time purposes over IP. Drawing on his wide study and functional improvement adventure in VoIP from its earliest levels, the writer offers an available connection with all of the appropriate criteria and state of the art suggestions in one resource.

Key Features:

  • 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 functional deployment concerns 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 e-book could be a beneficial consultant for pro community engineers, designers and bosses, choice makers and undertaking managers overseeing VoIP implementations, industry analysts, and experts. complicated undergraduate and graduate scholars project 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 companies, then grew to become CTO of Comverse after the purchase of NetCentrex. He now manages Actility, supplier of IMS dependent M2M and smartgrid infrastructure and applications.

Content:
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 subject matters: NAT Traversal (pages 393–416):

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Extra info for IP Telephony, Second Edition

Example text

The main advantage of statistical multiplexing is that it allows the bandwidth to be used more efficiently, especially when there are many conversations multiplexed on the same line (see companion book, Beyond VoIP protocols Chapter 5 for more details). But statistical multiplexing, as the name suggests, introduces uncertainty in the network. As just mentioned, in the case of TDM a delay of up to 125 μs could be introduced at each switch; this delay is constant throughout the conversation. 4): if the transmission line is empty when you need to send a chunk of data, it will go through immediately.

This is where it becomes tricky, because each RTP packet has an IP header of 20 octets, a UDP header of 8 octets, and an RTP header of 12 octets! 6-kbit/s overhead—much more than the actual bitrate of most narrow-band codecs! Therefore, most implementations choose to send multiple frames per packet, and the real frame length is in fact the sum of all frames stacked in a single IP packet. This is limited by echo and interactivity issues (see companion book, Chapter 3 Beyond VoIP Protocols). A maximum of 120 ms of encoded voice should be sent in each IP packet.

1 RTCP packet types There are various types of RTCP messages defined for each type of information: • SR: sender reports contain transmission and reception information for active senders. • RR: receiver reports contain reception information for listeners who are not also active senders. • SDES: source description describes various parameters relating to the source, including the name of the sender (CNAME). • BYE: sent by a participant when he leaves the conference. • APP: functions specific to an application.

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