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In this work we investigate the relative efficiency of 34 Brazilian Landline Telephone Service companies using Data Envelopment Analysis with weight constraints in the input and output variables. We formulate two different models that take into account the performance of the companies with respect to the criteria defined by Brazilian National Agency of Telecommunications (ANATEL). We also illustrate the potential of efficiency improvement through the simulation of corporate Merger. Neste trabalho investigamos a eficiência relativa das 34 operadoras do Setor de Telefonia Fixa Comutada através da utilização de Análise de Envoltória de Dados com restrições nos pesos das variáveis de input e output. Formulamos dois modelos distintos que levam em consideração o desempenho das empresas quanto aos critérios definidos pela Agência Nacional de Telecomunicações (ANATEL). Também ilustramos o potencial de melhoria de eficiência através de simulações de fusões corporativas (Merger)

On the evalution of Brazilian landline telephone services companies