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Operational Bulletin No. 781 (1.II.2003) and Annexed List: Various tones used in national networks (According to ITU-T Recommendation E.180) (03/1998) (Position on 1 February 2003)

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 Operational Bulletin No. 781 (1.II.2003) and Annexed List: Various tones used in national networks (According to ITU-T Recommendation E.180) (03/1998) (Position on 1 February 2003)

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