Abstract
Contingency in network elements (switching systems, trunk groups) creates a significant increase in repeated call attempts. Accumulated requests for connection in the contingent state of the network result in an overloading of the communication route. Such an overloading will continue for some time despite the contingent state removal. This paper considers the influence of such a state on the telephone service quality. However, there are no concrete mathematical models to resolve such a problem. A mathematical model is proposed to provide a practical solution for the contingent states in the network. A more accurate method for evaluating the telephone service quality in the post-contingent state of the network is presented.
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