Simple On-Demand Overlays for Reliable Real-Time Traffic in Enterprise Networks.
Bengi Karaçali, Mark J. Karol, A. S. Krishnakumar, Parameshwaran Krishnan, Jean Meloche · 2006
Abstract — Real-time applications such as IP Telephony demand strict quality of service (QoS) from the underlying network. As more enterprises deploy IP Telephony, it is becoming imperative to significantly improve the network reliability as seen by these applications. As such, we recently proposed a practical overlay architecture, ORBIT (Overlays providing Reliability for Better IP Telephony). Our architecture consists of intelligent endpoints and independent relays. The endpoints rapidly detect network QoS degradation and find alternate application layer paths (mid-call) to the destination that avoid the problems. The overlay is activated only on-demand and the system is easy to deploy. In this paper, we compare two measurement techniques, describe our initial prototype and provide empirical results of the prototype’s reaction time to network problems that indicate rapid response to QoS degradation.