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SIP Providers' Awareness of Media Connectivity

Authors:
Stefan Gasterstädt
Markus Gusowski
Bettina Schnor

Keywords: Voice-over-IP (VoIP), media connectivity, SCTP

Abstract:
Voice-over-IP (VoIP) has become an important service in the Internet. In contrast to the Public Switched Telephone Network where the delivery of all messages and streams is the responsibility of the calling parties’ providers, VoIP media data is sent directly between the user agents without provider interaction in most cases. Hence, a VoIP provider is not aware of media connectivity, i. e., whether a call was successful or not. This may lead to incorrect behavior when a VoIP provider offers services beyond signaling (for example, SPIT prevention, payment). In this paper, we discuss several approaches for the detection of media connectivity and present a solution that conforms with the existing standards. The modified behavior of the user agents, the use of SCTP and provider’s awareness of media connectivity are described in detail. Finally, measurements show that our solution results in neglectable overhead.

Pages: 157 to 163

Copyright: Copyright (c) IARIA, 2011

Publication date: January 23, 2011

Published in: conference

ISSN: 2308-4413

ISBN: 978-1-61208-113-7

Location: St. Maarten, The Netherlands Antilles

Dates: from January 23, 2011 to January 28, 2011