двухтоновый предупреждающий сигнал
(МСЭ-Т Н.248.23).
[http://www.iks-media.ru/glossary/index.html?glossid=2400324]
Англо-русский словарь нормативно-технической терминологии. academic.ru. 2015.
двухтоновый предупреждающий сигнал — (МСЭ Т Н.248.23). [http://www.iks media.ru/glossary/index.html?glossid=2400324] Тематики электросвязь, основные понятия EN dual tone alerting signalDT AS … Справочник технического переводчика
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