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Call-Back and alternative calling procedures (Res. 21 Rev. PP-2006)

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You are here Home > ITU Publications > Standardization (ITU-T) > Service Publications > Call-Back and alternative calling procedures (Res. 21 Rev. PP-2006) > 2011

Call-Back and alternative calling procedures (Res. 21 Rev. PP-2006)
Year: 2011
Persistent link: http://handle.itu.int/11.1002/pub/8051b9af-en

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