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US 4,048,451 AGranted
Arrangement for monitoring live call disposition signals
AssigneeBell Telephone Laboratories, Incorporated
InventorGary Keith McNees
Life of this patent
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AssigneeBell Telephone Laboratories, Incorporated
InventorGary Keith McNees
Estimating the term…
The reliable detection of call disposition signals to identify the ultimate dispositions of calls switched over a cross-office connection is achieved by attaching monitoring equipment to the sender that has been seized by an incoming trunk circuit of a telephone switching office. Sender release which normally occurs after the completion of outpulsing is inhibited to maintain the trunk in the split condition normally assumed during outpulsing. A tone detector, attached to the called side of the prolonged split, samples the returning call disposition tones or speech signals and allows a call disposition monitor to preliminarily classify them. The output of the tone detector is also sent to a computer for more detailed and complete analysis. If the preliminary categorization indicates that the received signal tone may be part of a disposition category group which requires further sampling and which may allow the calling customer to quickly disconnect, cut-through is delayed for an additional interval to ensure that the computer will have sufficient samples of the incoming signal tones that are free of spurious and random speech and noise energy emanating from the calling side of the split.
In a telecommunications switching system in which call disposition signals are applied during the establishment of a connection, said system including a plurality of terminal path circuits for transmitting call signaling information and means for splitting the called from the calling sides thereof operative incident to the processing of call signaling information, the improvement comprising:
In a telecommunications switching system in which the call disposition signals are applied during the establishment of the connection, said system including a plurality of trunk circuits having means for splitting the called from the calling sides thereof incident to the attachment of a sender for transmitting call signaling information, the improvement comprising:
In a telecommunications switching system in which each of a group of signals applicable at a destination side of a cross-office connection during the establishment of a call thereover has a unique tone pattern and represents a distinct disposition of said call, said system including one of a plurality of trunk circuits seized for use to establish said call and operable in a split condition wherein any of said group of signals applied at said destination side is isolated from other signals generated at an originating side of said one of said trunk circuits, an arrangement for automatically monitoring said one of said trunk circuits to determine an actual disposition of said call comprising:
In a switching system wherein one of a plurality of trunk circuits is seized for connection to a cross-office communications path, is normally operated during the establishment of said path in a split condition wherein the called side thereof is split from the calling side thereof and is released by a calling party upon hearing particular types of tone, live tone analysis circuitry comprising:
Dependencies are inferred from the claim text.