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Home › Tone-detection method for detecting at least one tone in a dual-tone multifrequency signal, call-progress method using the same

Tone-detection method for detecting at least one tone in a dual-tone multifrequency signal, call-progress method using the same

US Patent 5495526 · Granted Feb 27, 1996

Estimated economic value: $14,946,000 ⓘ

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