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Home › System and method for efficiently transporting dual-tone multi-frequency/multiple frequency (DTMF/MF) tones in a telephone connection on a network-based telephone system

System and method for efficiently transporting dual-tone multi-frequency/multiple frequency (DTMF/MF) tones in a telephone connection on a network-based telephone system

US Patent 6259691 · Granted Jul 10, 2001

Estimated economic value: $4,885,000 ⓘ

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