PBX voice mail interface
April 7, 2009. 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 ReferencesUniversal receiver/sender Signal processor for use with a telephone system and a digital transmission line Series connected interceptor Signaling protocol channel unit PBX Intercept and caller interactive attendant bypass system PBX DID and E and M tie trunk integration adapter and method Direct inward dial integration apparatus Patent #: 4811381 InventorAssigneeApplicationNo. 338514 filed on 04/07/1989US Classes:379/233, Direct inward dialing379/88.19, Call source identification379/235, Voice frequency signalling over trunk379/240Interexchange trunk circuitExaminersPrimary: Brown, Thomas W.Attorney, Agent or FirmInternational ClassesH04M 003/50H04M 007/14 AbstractAn interface is described which attaches between the incoming trunk lines from a central office and a PBX system and which monitors the communication between the central office and the PBX to record the signals representative of telephone extension of a called party for later downloading to telephone peripheral equipment attached to the PBX, such as voice mail systems. The interface passively monitors the line during handshake communication between the central office and the PBX and receives the digits of the dialed extension and stores them in memory. The interface then monitors the line for a request to send from the peripheral equipment attached to the PBX. When the request is received, the interface assumes supervision of the telephone line by terminating the line to the central office and the line to the PBX. The interface then downloads the digits of the dialed extension to the telephone peripheral equipment, such as a voice mail system, for identifying the extension to which the message belongs. Two embodiments of the present invention are described in which the interface can operate with either DID trunk lines attached to a PBX system or with POTS (Plain Old Telephone Service) lines attached to a PBX.Other References
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