ITU-T E.181 Customer Recognition of Foreign Tones - Telephone Network and ISDN - Operation, Numbering, Routing and Mobile Service (Study Group II) 2 pp
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ITU-T E.181 Document Information:
Title
Customer Recognition of Foreign Tones - Telephone Network and ISDN - Operation, Numbering, Routing and Mobile Service (Study Group II) 2 pp
International Telecommunication Union/ITU Telcommunication Sector
Publication Date:
Nov 1, 1988
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