Combining quality of services path first routing and admission control to support VoIP traffic

Abstract

Existing interactive communication applications, like VoIP, are designed to manage losses and delay in real IP networks. We present a novel call admission control for VoIP based on blocking percentage calculation (BPC). Blocking rates were measured carrying VoIP for every router across the source–destination path. Ingress router selects the optimal path for the new request by calculating blocking rates across all source–destination paths. The proposed scheme dynamically adjusts the admission threshold to guarantee the voice quality of each flow. A simple algorithm design and evaluation results show that the proposed scheme is effective to achieve high utilization of network resources, while satisfying end-to-end targets in terms of blocking rate, delay, packet loss rate and fairness.