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
NORMA vydaná dňa 3.4.1987
Označenie normy: GB/T 7623-1987
Dátum vydania normy: 3.4.1987
Krajina: Čínska technická norma
Kategória: Technické normy GB