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US Patent 5267305 - Transparent inband signaling
US Patent Issued on November 30, 1993
Estimated Patent Expiration Date:
July 29, 2011Estimated 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.
Estimated Patent Expiration Date:
July 29, 2011Estimated 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.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
| 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)Field of Search379/283, Dual tone multifrequency (DTMF) receiver379/224, Tandem switching center379/233, Direct inward dialing379/234PBX to central office signalling (e.g., direct outward dialing)ExaminersPrimary: Dwyer, James L.Assistant: Matar, Ahmad F. Attorney, Agent or FirmUS Patent References3478174, 3676606, 3715518, 3859473, 3881060, 3985971, TelephonyIssued on: 10/12/1976 Inventor: Colpoys4081614, Supervised single link telephone system Issued on: 03/28/1978 Inventor: Dahlquist, et al.4191860, Data base communication call processing method Issued on: 03/04/1980 Inventor: Weber4348554, Method of providing virtual private network telephone service Issued on: 09/07/1982 Inventor: Asmuth4371752, Electronic audio communication system Issued on: 02/01/1983 Inventor: Matthews , et al.4400587, Overflow and diversion to a foreign switch Issued on: 08/23/1983 Inventor: Taylor , et al.4446553, Arrangement for multiple custom calling Issued on: 05/01/1984 Inventor: Webber4521647, Tone detection system and method Issued on: 06/04/1985 Inventor: Olson , et al.4600814, Automated system for establishing telephone voice connections Issued on: 07/15/1986 Inventor: Cunniff , et al.4677658, Remote dictating apparatus Issued on: 06/30/1987 Inventor: Kolodny , et al.4696028, PBX Intercept and caller interactive attendant bypass system Issued on: 09/22/1987 Inventor: Morganstein , et al.4723273, Discretionary call forwarding Issued on: 02/02/1988 Inventor: Diesel , et al.4737983, Automatic call distributor telephone service Issued on: 04/12/1988 Inventor: Frauenthal , et al.4757497, Local area voice/data communications and switching system Issued on: 07/12/1988 Inventor: Beierle , et al.4930153, PBX voice mail interface Issued on: 05/29/1990 Inventor: Hagedorn5022069Modular automatic telephone switching system Issued on: 06/04/1991 Inventor: Chen International ClassesH04M 003/58H04M 003/56 |
