Congestion Avoidance Using DYnamic COdec MAnagement: A solution for ISP

The large diffusion of VoIP is an essential key for the success of emerging Internet service providers. These ISPs conflict with the interests of historical and predominant network maintainers which often control the network infrastructure and telephone services. To win this competition, emerging ISPs have to adopt strategic QoS solutions which will capture the attention of network users and phone clients. This paper presents a solution which is able to obtain the same performance of a 64 Kbps channel reducing the costs for over-provisioning network bandwidth. DyCoMa is a mechanism studied for VoIP applications in network with a limited bandwidth for multimedia services. It works preventing network congestion without blocking incoming calls and maintaining under control end-to-end QoS. This solution could be adopted by ISP which would like to offer VoIP services without investing huge capital in bandwidth resources