June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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This is the Title of the Book, eMatter Edition
Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.
Key Issues: Quality of Service
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Key Issues: Quality of Service
• Quality of Service is decreased when packet loss, jitter, and latency increase.
• There are two styles of Quality-of-Service mechanisms to deal with the problem:
CoS and QoS.
• CoS solutions are coarsely grained, best-effort approaches the rely on packet pri-
oritization.
• CoS solutions are best in situations in which voice traffic represents 30% or less
of the total traffic, such as enterprise networks.
• 802.1p and DiffServ are the two most common CoS solutions for Voice over IP.
• QoS solutions are finely grained, guaranteed-delivery approaches that reserve
bandwidth across the network.
• QoS solutions are best when there is limited bandwidth, or in carrier-grade net-
works.
• COPS is a system for centrally storing and maintaining QoS and CoS policies.
• RSVP is the most common QoS solution for enterprise-grade voice services over
IP.
• Some ISPs offer QoS services to facilitate the use of the Internet and/or VPN for
voice applications.
• Many small-office and residential broadband routers support 802.1p, and a few
even support DiffServ.
• Linux’s kernel-based firewall, Netfilter, can be used as a DiffServ edge router if
the Linux Traffic Control components are compiled into the Linux kernel.
• In Windows NT, 2000, and ...
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