- supervisory\ tones
- контрольные тональные сигналы. Cигналы, указывающие, главным образом, на осуществление вызова абонентом, его занятость или недостижимость.
Англо-русский cловарь терминов и сокращений по мобильной радиосвязи стандарта GSM. 2013.
supervisory\ tones
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