A procedure for multi-criteria selection of optimal design solutions is proposed, taking into account the set of contradictory indicators of designed telecommunication system quality. In the procedure, the formal numerical method of weighting factors for solving the MCO problem is supplemented with an informal procedure by the method of narrowing the Pareto set for choosing the only best solution using additional expert information from a decision maker (DM). The inclusion of the decision maker in the interactive mode allows to refine the solution and bring it closer to the goal. In contrast to formal numerical methods, this allows changing the values of some partial criteria in dynamics to achieve the required quality of the optimized system. The problem of choosing a speech codec for IP networks is solved using the proposed procedure. The selection of a set of partial criteria has been substantiated. Solutions are obtained for different values of the weights of partial criteria with the involvement of a decision maker. The results obtained allow to conclude that the proposed procedure can be used by popular IP-PBXs when justifying the choice of an optimal codec version for the user.
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