Original Assignee IQ Systems Inc Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Robinson Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related Application number US09/182,037 Inventor Jeffrey I. Google Patents Methods and apparatus for intercepting dual-tone multi-frequency (DTMF) signals and for redialing the intercepted signals with additional DTMF signalsĭownload PDF Info Publication number US6408067B1 US6408067B1 US09/182,037 US18203798A US6408067B1 US 6408067 B1 US6408067 B1 US 6408067B1 US 18203798 A US18203798 A US 18203798A US 6408067 B1 US6408067 B1 US 6408067B1 Authority US United States Prior art keywords dtmf dtmf tones tones telephone line transmitting Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US6408067B1 - Methods and apparatus for intercepting dual-tone multi-frequency (DTMF) signals and for redialing the intercepted signals with additional DTMF signals US6408067B1 - Methods and apparatus for intercepting dual-tone multi-frequency (DTMF) signals and for redialing the intercepted signals with additional DTMF signals

Dtmf frequency