By Olivier Hersent
ISBN-10: 047066584X
ISBN-13: 9780470665848
All you want to find out about deploying VoIP protocols in a single entire and hugely functional reference - Now up to date with insurance on SIP and the IMS infrastructure
This publication presents a entire and sensible review of the expertise in the back of net Telephony (IP), delivering crucial details to community Engineers, Designers, and executives who have to comprehend the protocols. in addition, the writer explores the problems excited by the migration of latest telephony infrastructure to an IP - established genuine time verbal exchange carrier. Assuming a operating wisdom of IP and networking, it addresses the technical points of real-time functions over IP. Drawing on his broad learn and useful improvement event in VoIP from its earliest levels, the writer presents an available connection with the entire correct criteria and state-of-the-art strategies in one resource.
Key Features:
- Updated with a bankruptcy on SIP and the IMS infrastructure
- Covers all of the significant VoIP protocols – SIP, H323 and MGCP
- Includes a wide part on functional deployment matters gleaned from the authors’ personal adventure
- Chapter at the intent for IP telephony and outline of the technical and enterprise drivers for transitioning to all IP networks
This booklet may be a important consultant for pro community engineers, designers and bosses, determination makers and undertaking managers overseeing VoIP implementations, marketplace analysts, and experts. complicated undergraduate and graduate scholars venture data/voice/multimedia communications classes also will locate this publication of interest.
Olivier Hersent based NetCentrex, a number one supplier of VoIP infrastructure for carrier companies, then turned CTO of Comverse after the purchase of NetCentrex. He now manages Actility, supplier of IMS established M2M and smartgrid infrastructure and applications.
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Extra info for IP Telephony: Deploying VoIP Protocols and IMS Infrastructure
Sample text
323, SIP, or MGCP and to help in the recurring debates about the ‘best’ codec. The reader wanting more detailed knowledge should read the voice-coding background chapter in the companion book, Beyond VoIP Protocols. 1 What is a good codec? org) tried to choose a default low-bitrate codec, sufficient to promote interoperability, they faced a difficult issue because there was not common agreement about what constituted a good codec. The difficulty was so great that other bodies who are also trying to profile VoIP applications are reticent to enter into the debate at all.
UDP also provides the notion of a ‘port’, which is a number between 0 and 65,535 (present in every packet as part of the destination address) which allows up to 65,536 UDP targets to be distinguished at the same destination IP address. A port is also attached to the source address and allows up to 65,536 sources to be distinguished from the same IP address. g. 23): therefore an RTP stream generated by a single source can reach several destinations; it will be duplicated as necessary by the IP network.
RTP must not be mixed up with protocols like RSVP (Resource Reservation Protocol). ). However, some routers are actually able to parse 6 IP TELEPHONY IP packets, discover whether these packets have RTP headers, and give these packets a greater priority, resulting in better QoS even without any external QoS mechanism, such as RSVP for instance. Most Cisco routers support the IP RTP PRIORITY command. , delineates the beginning and end of the information transported), over any network. 2 RTP RTP allows the transport of isochronous data across a packet network, which introduces jitter and can desequence the packets.