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Summary: An Overlay Architecture for High Quality
VoIP Streams
Yair Amir, Member, IEEE, ACM, Claudiu Danilov, Stuart Goose, David Hedqvist,
and Andreas Terzis, Member, IEEE, ACM
Abstract-- The cost savings and novel features associated with
Voice over IP (VoIP) are driving its adoption by service providers.
Unfortunately, the Internet's best effort service model provides
no quality of service guarantees. Because low latency and jitter
is the key requirement for supporting high quality interactive
conversations, VoIP applications use UDP to transfer data,
thereby subjecting themselves to quality degradations caused by
packet loss and network failures.
In this paper we describe an architecture to improve the
performance of such VoIP applications. Two protocols are used
for localized packet loss recovery and rapid rerouting in the event
of network failures. The protocols are deployed on the nodes of
an application-level overlay network and require no changes to
the underlying infrastructure. Experimental results indicate that
the architecture and protocols can be combined to yield voice
quality on par with the PSTN.
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