Estimation of Multiplexing Gain on Small Business VoIP Networks

In this paper we shall establish a set of dimensioning rules for different VoIP networks using various measurement-based user behavior properties as input parameters. In order to solve the problem of dimensioning VoIP networks we focus on the aggregated VoIP links. These dimensioning procedures undoubtedly play an important role in efficiently operating extreme telephony networks like call centers and Small Businesses. Such special networks produce traffic characteristics significantly different from those of PSTN networks or general VoIP networks. Our purpose is to use simple input parameters in order to estimate the traffic characteristics of a certain link. By keeping the QoS parameters in sufficient range we present a solution to approximate link usage. The communication may be characterized with special properties such as few but very active subscribers, high internal call rate, very long-, or very short call durations, etc. In this way a simple and useful dimensioning method is achieved, utilizing the very properties of such networks, which may reduce the number of required voice channels operated.