ITU-T Q.254-1988
2.1 Telephone Signals - Specifications of Signalling System No. 6 (Study Group XI) 4 pp

Standard No.

ITU-T Q.254-1988

Release Date

1988

Published By

International Telecommunication Union (ITU)

Status

Withdraw

Latest

ITU-T Q.254-1988

Scope

A signal sent in the forward direction on semi-automatic calls when the outgoing international exchange operator wants the help of an operator at the incoming international exchange.

ITU-T Q.254-1988 history

• 1988 ITU-T Q.254-1988 2.1 Telephone Signals - Specifications of Signalling System No. 6 (Study Group XI) 4 pp