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Instructions for the International Telephone Service

image of Instructions for the International Telephone Service

These instructions include Recommendation ITU-T E.141 which was withdrawn on 20 March 2003 by Circular 156.

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Supervision of calls

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Authors
International Telecommunication Union

24 Jul 2007

3 pages

http://handle.itu.int/11.1002/pub/800c8247-857550eb-en

Pages: 158 - 160

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