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TAC looked into the matter after Telia Finland brought a complaint against Sonera in November 1998, claiming that it was unable to operate in Sonera's network because the way it charged for connection was, in fact, illegal.
Sonera claims that it has a different method of calculating the interconnection fees. The company asserts that the fees are higher because the operator has to develop the network continuously. It also claimed that TAC had not taken the company's investment risks into account.