OSLO, Norway, Nov. 15 -- North Sea Communications AS, an independent telecommunications operator in the North Sea region and a TeliaSonera subsidiary, has made interconnection agreements with the Statoil-owned TampNett network, of Norway, and Central North Sea Fibre Telecommunications Co. Ltd., owned by BP UK, to link their optical networks in the North Sea. More than 1 billion Norwegian krone has been invested in the three major North Sea optical networks, which are now capable of serving cross-border customers. 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