A real-time network simulation application for multimedia over IP

This paper details a secure voice over IP (SVoIP) development tool, the network simulation application (Netsim), which provides real-time network performance implementation of quality of service (QoS) statistics in live real-time data transmission over packet networks. This application is used to implement QoS statistics including packet loss and inter-arrival delay jitter. Netsim is written in Visual C++ using MFC for MS Windows environments. The program acts as a transparent gateway for a SVoIP server/client pair connected via IP networks. The user specifies QoS parameters such as mean delay, standard deviation of delay, unconditional loss probability, conditional loss probability, etc. Netsim initiates and accepts connection, controls packet flow, records all packet sending / arrival times, generates a data log, and performs statistical calculations.