1     Scope
 2     Abbreviations and definitions
 3     Interface procedures at call-originating data station
 4     Interface procedure at answering data station
 5     Proposed line procedures
 6     Manually controlled modem calling automatically controlled modem
 7     Automatically controlled calling modem calling manually controlled modem
 8     Disabling of echo suppressors in the case of manually operated data stations
 9     Notification to ordinary telephone users
10     Manual selection of automatic answering, data mode and voice mode
11     2100 Hz tone recognition