ITU-T Q.4-1989
Automatic Switching Functions for Use in National Networks - General Recommendations on Telephone Switching and Signalling - Functions and Information Flows for Services in the ISDN - Supplements (Study Group XI) 8 pp

Standard No.

ITU-T Q.4-1989

Release Date

1989

Published By

International Telecommunication Union (ITU)

Status

Withdraw

Latest

ITU-T Q.4-1989

Scope

Some of the functions listed are required in all types of exchanges. Others may or may not be, according to the role of the exchange, e.g. local, combined local/transit, transit, international, etc.

ITU-T Q.4-1989 history

• 1989 ITU-T Q.4-1989 Automatic Switching Functions for Use in National Networks - General Recommendations on Telephone Switching and Signalling - Functions and Information Flows for Services in the ISDN - Supplements (Study Group XI) 8 pp