Automatic answering equipment and/or parallel automatic calling equipment on the general switched telephone network including procedures for bling of echo control devices for both manually and automatically established calls
NORM herausgegeben am 3.4.1987
Bezeichnung normen: GB/T 7623-1987
Ausgabedatum normen: 3.4.1987
Land: Chinesische technische Norm
Kategorie: Technische Normen GB