ITU-T E.181-1988
Customer Recognition of Foreign Tones - Telephone Network and ISDN - Operation, Numbering, Routing and Mobile Service (Study Group II) 2 pp

Standard No.

ITU-T E.181-1988

Release Date

1988

Published By

International Telecommunication Union (ITU)

Status

Withdraw

Replace By

ITU-T E.181-1993

Latest

ITU-T E.181-1993

Scope

On the other hand there is no necessity for standardizing digital generated tones in a more stringent way than analogue generated tones for the following reasons

ITU-T E.181-1988 history

• 1993 ITU-T E.181-1993 Customer Recognition of Foreign Tones
• 1988 ITU-T E.181-1988 Customer Recognition of Foreign Tones - Telephone Network and ISDN - Operation, Numbering, Routing and Mobile Service (Study Group II) 2 pp