Description
The authoritative guide to Internet voice communications -- now completely updated for the latest standards and technologies -- Completely updated New chapters on traffic engineering, gateways, and IP call processing protocols (RSVP/DiffServ). -- One of the first books to cover Telephony Routing Over IP (TRIP) -- the powerful new protocol for ensuring the speed of voice message delivery. -- In-depth Quality of Service (QoS) coverage -- including a practical introduction to Cisco Voice QoS network optimization. Voice Over IP, Second Edition is the essential guide for telecommunications professionals who must understand voice-over-IP -- or deploy it. Leading network consultant Uyless Black carefully evaluates both the challenges and advantages of VoIP, and then reviews each of the technical standards, platforms, and challenges associated with successful deployment. This thoroughly updated Second Edition reflects major enhancements to VoIP standards and practice, with detailed new chapters on gateways, IP call processing protocols, and traffic engineering. Black begins by reviewing the key characteristics of the Internet and IP that make VoIP challenging, including packet loss and variable delay. He introduces the role of digital signal processors (DSPs) and voice coders in VoIP, and shows how to establish paths to service providers through the local loop via ISDN, xDSL, HFC or other approaches. Next, he covers emerging VoIP protocols and standards designed to improve VoIP and allow IP networks to interoperate with the public switched telephone network. The book includes detailed coverage of RSVP and DiffServ, as well as briefer introductions to H.322, Megaco, MGCP, and SIP.This Edition is one of the first VoIP books to cover Telephony Routing Over IP (TRIP), a new protocol that standardizes the exchange of gateway routing information, enabling faster, more reliable and cost-effective voice connections. It also presents authoritative new coverage of Cisco Voice QoS, including traffic prioritization, congestion control, signaling, QoS management, policy control, and more.
