Transparent inband signaling
Patent 5267305 Issued on November 30, 1993. Estimated Expiration Date: 
July 29, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 29, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3478174 3676606 3715518 3859473 3881060 Telephony Supervised single link telephone system Data base communication call processing method Method of providing virtual private network telephone service Electronic audio communication system InventorsAssigneeApplicationNo. 737494 filed on 07/29/1991US Classes:379/233, Direct inward dialing379/202.01, Conferencing379/210.02, Call blocking379/234PBX to central office signalling (e.g., direct outward dialing)ExaminersPrimary: Dwyer, James L.Assistant: Matar, Ahmad F. Attorney, Agent or FirmInternational ClassesH04M 003/58H04M 003/56 AbstractA method and apparatus for transparent inband signaling during a telephone conversation provides an advantageous way of enabling a party to a telephone conversation to signal a telecommunications system to perform desired functions. A person signaling a system with a general inband signal, such as DTMF, can do so transparently, that is without the other party hearing the inband signals used. This innovation is based on detecting the inband signal, muting the inband signal to prevent the other party from hearing it, and determining which party generated it while allowing the conversation to continue substantially uninterrupted. The inband signal is delayed prior to muting for a short period of time in an alternate embodiment in order to compensate for the time delay in reliably detecting DTMF signals thus mute the inband signal more completely.Other References
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