the international telephone service is becoming more and more automatic, and that only a few manual circuits will be kept to form a reserve network
ITU-T E.300-1993 Referenced Document
ITU-T E.300 Special Uses of Circuits Normally Employed for Automatic Telephone Traffic
ITU-T E.320 SPEEDING UP THE ESTABLISHMENT AND CLEARING OF PHOTOTELEGRAPH CALLS
ITU-T E.300-1993 history
1993ITU-T E.300-1993 Special Uses of Circuits Normally Employed for Automatic Telephone Traffic
1988ITU-T E.300-1988 Special Uses of Circuits Normally Employed for Automatic Telephone Traffic - Telephone Network and ISDN - Operation, Numbering, Routing and Mobile Service (Study Group II) 2 pp