PBX telephone call control system
First Claim
1. A call control system for being coupled to a PBX in order to control the routing of telephone calls from one or more calling parties through said PBX between a plurality of internal telephone subscriber lines and a plurality of incoming and outgoing external trunks, said system comprisinga line interface unit connected to some of said PBX subscriber lines for simulating a plurality of extensions which can be called by one or more of said incoming external trunks or said internal telephone subscriber lines to provide a multiple call processing capability, said line interface unit includingmeans for detecting if a calling party using one of said incoming external trunks or said internal telephone subscriber lines is calling one of said plurality of simulated extensions,means for answering and informing said calling party to signal an external party called number corresponding to a telephone station which must be accessed using one of said outgoing external trunks,means for receiving and decoding said external party called number when signaled,means for flashing and DTMF means for signaling said PBX to request a transfer of said calling party on said incoming external trunks or said internal telephone subscriber lines, andmeans for flashing and DTMF means for signaling said PBX to attempt said transfer to said one of said outgoing external trunks.
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Accused Products
Abstract
A PBX telephone call control system is disclosed. The system provides a line interface unit connection between a plurality of subscriber line extensions and a private branch exchange (PBX) switching equipment. The call control system appears to the PBX like any other telephone extension within the office environment and provides the user with more features in conjuction with the pre-existing PBX equipment, providing expanded capabilities at a reasonable expense.
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Citations
17 Claims
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1. A call control system for being coupled to a PBX in order to control the routing of telephone calls from one or more calling parties through said PBX between a plurality of internal telephone subscriber lines and a plurality of incoming and outgoing external trunks, said system comprising
a line interface unit connected to some of said PBX subscriber lines for simulating a plurality of extensions which can be called by one or more of said incoming external trunks or said internal telephone subscriber lines to provide a multiple call processing capability, said line interface unit including means for detecting if a calling party using one of said incoming external trunks or said internal telephone subscriber lines is calling one of said plurality of simulated extensions, means for answering and informing said calling party to signal an external party called number corresponding to a telephone station which must be accessed using one of said outgoing external trunks, means for receiving and decoding said external party called number when signaled, means for flashing and DTMF means for signaling said PBX to request a transfer of said calling party on said incoming external trunks or said internal telephone subscriber lines, and means for flashing and DTMF means for signaling said PBX to attempt said transfer to said one of said outgoing external trunks.
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5. A call control system for being coupled to a PBX in order to control the routing of telephone calls from one or more calling parties through said PBX between a plurality of incoming external trunks and a plurality of internal telephone subscriber lines comprising
a line interface unit connected to some of said PBX subscriber lines for simulating a plurality of telephone extensions which can be called by said one or more calling parties through said incoming external trunks or through internal telephones connected to others of said internal telephone subscriber lines to provide a multiple call processing capability, said line interface unit including means for detecting if a calling party using one of said incoming external trunks or said internal telephones is calling one of said simulated extensions, means for answering said calling party who is using one of said incoming external trunks or said internal telephones and informing said calling party to signal a certain extension number corresponding to one of said internal telephones connected to one of said PBX internal telephone subscriber lines, means for receiving and decoding said extension number from said calling party when signaled, and means for flashing and DTMF means for signaling said PBX to attempt a transfer of the call on said incoming external trunk or said internal telephone subscriber line to said extension having said certain number.
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11. In a call control system for being coupled to a PBX in order to control the routing of telephone calls from one or more calling parties through said PBX between a plurality of incoming external trunks and a plurality of internal telephone subscriber lines, said system including
a line interface unit connected to some of said PBX subscriber lines for simulating a plurality of telephone extensions which can be called by said one or more calling parties through said incoming external trunks or through internal telephones connected to others of said internal telephone subscriber lines, the method comprising the steps of detecting if a calling party on one of said incoming external trunks or said internal telephones is calling one of said simulated extensions, answering the call and informing said calling party to signal an extension number corresponding to one of said internal telephones connected to one of said PBX internal telephone subscriber lines, receiving and decoding said extension number from said calling party when signaled, and flashing and DTMF signaling said PBX to attempt a transfer of the call on one of said incoming external trunks or one of said other internal telephone subscriber lines to said telephone having said extension number.
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12. A call control system to control the routing of telephone calls from outside of a PBX coming via a plurality of incoming external trunks to access a plurality of internal telephone subscriber lines comprising
a line interface unit connected to some of said PBX subscriber lines for simulating a plurality of extensions which can be called by one or more of said incoming external trunks to provide a multiple call processing capability, said line interface unit including means for detecting if a telephone call is coming from a calling party on one of said incoming external trunks, means for answering said telephone call on said one of said incoming external trunks, means for giving voice instructions to said calling party to inform said calling party to signal an extension number corresponding to a telephone station connected to any one of said PBX internal telephone subscriber lines, means for decoding said extension number from said calling party when signaled, and means for flashing and DTMF means for signaling said PBX to attempt to ring the telephone station connected to the subscriber line corresponding to said signaled extension number.
Specification