Voice over the Software Defined Cognitive Packet Network

Voice over IP (VOIP) networks have strict Quality of Service (QoS) constraints and require real-time packet delivery which poses a major challenge to IP networks. The Cognitive Packet Network (CPN) has been designed as a Software Defined Network Substrate that provides user-oriented QoS by adaptively routing packets based on online sensing and measurement. We therefore design and evaluate a “Voice over CPN” system that matches the needs of voice packet delivery in the presence of background traffic under varied traffic conditions. The QoS “goal” function that addresses “Jitter” according to its definition in RFC3393 has been incorporated in CPN via new functionalities that support multiple QoS classes for multiple traffic flows. The resulting system is evaluated via measurements of packet delay, delay variation (jitter) and packet loss for the voice and the background traffic.