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Operational Bulletin No.955 (1.V.2010) and Annexed List: Various tones used in national networks (According to ITU-T Recommendation E.180) (03/1998) (Position on 1 May 2010)

Operational Bulletin No.955 (1.V.2010) and Annexed List: Various tones used in national networks (According to ITU-T Recommendation E.180) (03/1998) (Position on 1 May 2010)
1.V.2010

Table of contents

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ENGLISH
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SPANISH
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FRENCH
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