Orchestration of Network-Wide Active Measurements for Supporting Distributed Computing Applications
IEEE Transactions on Computers
Assessing readiness of IP networks to support desktop videoconferencing using OPNET
Journal of Network and Computer Applications
An analytical simulator for deploying IP telephony
International Journal of Network Management
Evaluation of gatekeeper proxies for firewall traversal in secure videoconferencing systems
International Journal of Internet Protocol Technology
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H.323 protocol based Voice and Video conferencing solutions are established popular technologies both in industry and academia. However, these bandwidth intensive applications are often plagued by various performance problems. In this paper we describe a few common end-to end performance problems noticed over several years in our ITU-T H.323 protocol-based "Video and Voice over IP" (VVoIP) infrastructure and provide a tool for troubleshooting these performance issues. Based on our operations experiences, we are developing a tool called the "H.323 Beacon" to measure, monitor and qualify the performance of H.323 sessions. We describe the development architecture and feature set of the H.323 Beacon, which can be used by a novice end-user, network engineer or conference-operator using VVoIP systems. H.323 Beacon is an application-specific network measurement tool that provides H.323-protocol specific evidence and other information necessary to troubleshoot H.323 application performance in the network and at the host (end-to-end). We also present 2 use-cases for the H.323 Beacon that demonstrate the utility of the tool for VVoIP performance debugging. Finally, we outline essential best practices for prevention and efficient resolution of intermittent and imminent failures of H.323 VVoIP applications.