PBX automatic number identification system
First Claim
Patent Images
1. In a telephone system having a PBX, a central office, and trunks interconnecting said PBX with said central office, said PBX comprising:
- a switching network having lines connected to its line side and said trunks connected to its trunk side,means responsive to the initiation of calls by a plurality of calling lines each requesting access to said central office for selecting a different idle one of said trunks for connection to each of said calling lines,means responsive to each selection of an idle trunk on a call for identifying the calling line and the selected trunk for said call,a memory having storage locations with a capacity for storing line and trunk identity information for a predetermined number of said calls,means responsive to each identification by said identifying means on a call for entering the calling line and trunk identity information into vacant locations of said memory,means including said memory for inhibiting said selecting means when said memory has reached its storage capacity and is unable to store additional call identity information,means responsive to each identification by said identifying means when said selection means is not inhibited for establishing a network connection from each of said calling lines to its selected trunk,a data channel interconnecting said PBX with said central office, andmeans for transmitting said identify information in said memory over said data channel to said central office.
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Abstract
A PBX is disclosed having automatic number identification (ANI) equipment for generating signals which identify the calling station and trunk numbers of outgoing calls. A memory is interconnected with the ANI equipment for storing the identification signals prior to transmission to a central office. The memory can store up to five sets of identification signals and aids in preventing dial tone delay by decreasing the probability that the ANI system will become overloaded due to central office delay.
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Citations
13 Claims
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1. In a telephone system having a PBX, a central office, and trunks interconnecting said PBX with said central office, said PBX comprising:
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a switching network having lines connected to its line side and said trunks connected to its trunk side, means responsive to the initiation of calls by a plurality of calling lines each requesting access to said central office for selecting a different idle one of said trunks for connection to each of said calling lines, means responsive to each selection of an idle trunk on a call for identifying the calling line and the selected trunk for said call, a memory having storage locations with a capacity for storing line and trunk identity information for a predetermined number of said calls, means responsive to each identification by said identifying means on a call for entering the calling line and trunk identity information into vacant locations of said memory, means including said memory for inhibiting said selecting means when said memory has reached its storage capacity and is unable to store additional call identity information, means responsive to each identification by said identifying means when said selection means is not inhibited for establishing a network connection from each of said calling lines to its selected trunk, a data channel interconnecting said PBX with said central office, and means for transmitting said identify information in said memory over said data channel to said central office. - View Dependent Claims (2, 3)
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4. In a switching system,
a switching network having lines connected to its line side and central office trunks connected to its trunk side, means for detecting the receipt from a calling one of said lines of a dialed prefix digit signifying a request for a network connection to an idle one of said trunks, a memory for storing call identity information for the calling ones of said lines dialing said prefix digit, said memory being limited in its capacity for concurrently storing said identity information for a predetermined number of calls, means responsible to said prefix digit detection for determining whether said memory is currently capable of storing additional call identity information, first means responsive to a storing determination by said determining means that said memory is capable of storing additional identity information for identifying said calling line, second means responsive to said storing determination for selecting an idle one of said trunks and for identifying said selected trunk, said network being responsive to the identification information from said first and second means for establishing a connection between said calling line and said selected trunk, means responsive to said network connection for providing central office dial tone to said calling line, means including said memory being responsive to said storing determination for entering the identity information of said calling line and said selected trunk from said first and second means into said memory, a data channel, and means operative whenever said memory contains any identity information for transmitting said stored identity information from said memory over said data channel to a central office.
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7. An automatic number identification arrangement for use in a PBX, said PBX having a switching network with lines connected to its line side and central office trunks connected to its trunk side, said PBX further having means for detecting the receipt of a dialed central office prefix digit on a call from a calling one of said lines, and means for establishing a network call connection between said calling line and a selected one of said central office trunks, said automatic number identification comprising:
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a random access memory for storing line an trunk identity information for said call connection, said memory being limited in capacity for concurrently storing identity information for a predetermined number of calls, means responsive to said prefix digit detection for determining whether said memory is capable of storing said line and trunk identity information for said call, means responsive to a determination by said determining means that said memory is capable of storing said line and trunk information for said call for activating said establishing means to establish said network connection, means responsive to the activation of the establishing means for identifying said calling line and said selected trunk, and means responsive to the above said identification for entering the calling line and selected trunk identity information into said memory. - View Dependent Claims (8, 9, 10, 11)
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12. In a telephone switching system having a PBX, a central office, data channels and central office trunks interconnecting said PBX with said central office, a switching network in said PBX having stations connected to its line side and said central office trunks connected to its trunk side, common control equipment in said PBX responsive to a call from one of said stations requesting access to said central office for interconnecting said one calling station via said network with one of said trunks, said PBX having automatic number identification equipment comprising:
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means operative with said network interconnection for identifying said calling station and said connected trunk, a memory having a predetermined number of storage locations for storing station and trunk identity information for a plurality of calls requesting said access, means responsive to said identification of said calling station and said connected trunk by said identifying means for entering the identities of said calling station and said connected trunk into a vacant one of said locations in said memory, means operative whenever said memory contains said station and trunk identity information corresponding to either one or a plurality of calls for signaling said central office over one of said data channels that said PBX is ready to transmit call identification information, means in said central office responsive to said ready signal from said PBX for signaling said PBX over said data channel that said central office is ready to receive said call identificaton information, means responsive to said signal from said central office to output station and trunk identity information for one of said calls from said memory, and means responsive to the outputted information from said memory for transmitting said station and trunk identity information of said one call over said data channel to said central office.
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13. A method of identifying calls in a telephone switching system having a PBX, a central office, at least one data channel and a plurality of trunks interconnecting said PBX with said central office, common control equipment in said PBX responsive to call from a calling one of said stations requesting access to said central office for interconnecting said calling station via said network with one of said trunks, said method comprising the steps of:
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identifying in cooperation with said network interconnection the calling station and the connected trunk of said call, entering the identity information for the calling station and the connected trunk for said call into a memory having capacity for storing identity information for a predetermined number of calls, signaling the central office over said data channel that the PBX is ready to transmit call identity information whenever said memory contains identity information corresponding to one or a plurality of calls, signaling the PBX over said data channel that the central office is ready to receive call identity information, reading identity information for at least one of said calls from said memory in response to the above ready signal, transmitting the identity information for said one call from said PBX to said central office over said data channel in response to the reading of said memory, and inhibiting the network interconnection of a calling station with one of said trunks whenever the call identity information in said memory corresponds to said predetermined number of calls.
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Specification