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1-800-OVERLAYS: Using Overlay Networks to Improve VoIP Quality

Summary: 1-800-OVERLAYS: Using Overlay Networks to
Improve VoIP Quality
Yair Amir, Claudiu Danilov, Stuart Goose, David Hedqvist, Andreas Terzis
Technical Report CNDS-2004-2 - Aug 23, 2004
Abstract-- Although telephony subscribers are accus-
tomed to the consistent voice quality and high reliability
of the traditional PSTN, the promise of a single converged
IP network to carry voice and data and the cost sav-
ings therein motivates the interest to adopt voice-over-IP
(VoIP) technologies. However, the Internet provides best ef-
fort delivery, without any inherent quality of service guar-
antees. Low latency is a key factor in supporting high
quality interactive conversations, and as such contempo-
rary VoIP solutions use UDP to transfer data over the IP
layer, despite being subject to network loss and failures.
This paper describes the use of an overlay network
through which streams of voice packets are transmitted.
Flexible application level overlay routers can understand
the stringent requirements of VoIP and implement new al-


Source: Amir, Yair - Department of Computer Science, Johns Hopkins University


Collections: Computer Technologies and Information Sciences