Большой англо-русский и русско-английский словарь
voice channel, voice-band channel, voice-grade channel
Англо-русский словарь технических терминов
speech channel, voice(-band) (voice-grade) channel, telephone link
Русско-английский политехнический словарь
speech channel, voice(-band) (voice-grade) channel, telephone link
Dictionnaire technique russo-italien
canale telefonico