Automatic route selection of a private telephone network path on the basis of a public telephone network number
First Claim
1. A method of establishing a switching connection between a first subscriber station connected to a first switching system and a second subscriber station connected to a second switching system with a public telephone network and a private telephone network interconnecting said switching systems, comprising the steps of:
- collecting a first set of dialing digits from said first subscriber station;
decoding a first predetermined subset of said first set to determine the telephone network specified by said dialing digits;
determining whether said switching connection can be established through said private telephone network by interrogating a second subset of said first set and individual remaining digits of said first set upon said first predetermined subset specifying said public telephone network;
translating said first set to a second set of dialing digits upon said switching connection being connectable through said private telephone network; and
establishing said switching connection through said private telephone network upon said switching connection being connectable through said private telephone network utilizing said second set of dialing digits for interconnecting said first subscriber station with said second subscriber station.
4 Assignments
0 Petitions
Accused Products
Abstract
A data structure and program routines for use in a private branch exchange telephone system (PBX) for automatically routing calls via a private telephone network in response to a dialed public telephone network number and for restricting outgoing calls from the PBX to specific public network telephone stations. In a large corporate PBX switching network interconnected by both a public telephone network and a private telephone network, a telephone set connected to one PBX system establishes a switch connection through the private network by dialing the public telephone network'"'"'s number for a destination telephone set connected to another PBX system. In response to the dialed number, the first PBX system automatically determines that the destination telephone set can be reached via the private telephone network and automatically converts the dialed public telephone network number to a private telephone network number designating the destination telephone set. The data structure allows access by PBX telephone sets to designated groups of telephone stations or specific individual telephone stations connected to the public telephone network to be restricted. In addition, if a PBX telephone set attempts to dial a restricted public telephone network station, the system first verifies that the dialed station is restricted to that particular PBX telephone set and then provides a procedure whereby the telephone user can enter a personal authorization code to enable the user to complete the call.
82 Citations
31 Claims
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1. A method of establishing a switching connection between a first subscriber station connected to a first switching system and a second subscriber station connected to a second switching system with a public telephone network and a private telephone network interconnecting said switching systems, comprising the steps of:
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collecting a first set of dialing digits from said first subscriber station; decoding a first predetermined subset of said first set to determine the telephone network specified by said dialing digits; determining whether said switching connection can be established through said private telephone network by interrogating a second subset of said first set and individual remaining digits of said first set upon said first predetermined subset specifying said public telephone network; translating said first set to a second set of dialing digits upon said switching connection being connectable through said private telephone network; and establishing said switching connection through said private telephone network upon said switching connection being connectable through said private telephone network utilizing said second set of dialing digits for interconnecting said first subscriber station with said second subscriber station. - View Dependent Claims (2, 3, 4, 5)
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6. A method of determining the presence of access restriction on communication from a plurality of subscriber stations each having a facility access authorization level and connected to a switching system to a public telephone unit having a facility access restriction level via a public telephone network, comprising the steps of:
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collecting a set of dialing digits from one of said subscriber stations; analyzing said set of dialing digits to determine the presence of access restriction control to said public telephone unit; comparing said facility access restriction level with said facility access authorization level of said one of said subscriber stations; and transmitting to said one of said subscriber stations a tone signal indicating that said public telephone unit is unaccessible to said one of said subscriber stations upon said facility access restriction level being greater than said facility access authorization level. - View Dependent Claims (7, 8, 9, 10)
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11. A method of seeking a communication path from a first PBX to a second PBX with said PBXs interconnectable by a public telephone network and a private telephone network in response to a public telephone network number dialed by a subscriber station connected to said first PBX by utilizing a data structure comprising data defining public telephone network number to private telephone network location number conversion and representing private telephone network location numbers stored relative to public telephone network number information, comprising the steps of:
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collecting a set of dialing digits comprising area code and office code subsets from said subscriber station defining said public telephone network number; accessing said data structure with said dialing digits; interrogating said data structure utilizing said area code and said office code subsets of said dialing digits to determine the availability of a communication path through said private telephone network; searching said data structure with the remainder of said set of said dialing digits to determine the location of said private telephone network location number upon said interrogating step indicating the availability of said communication path; retrieving the private telephone network location number from said data structure upon said communication path through said private telephone network being available; and establishing said communication path through said private telephone network utilizing said private telephone network location number upon said communication path through said private telephone network existing. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method of determining the presence of access restriction on communication from a plurality of subscriber stations each having a facility access authorization level and connected through a PBX to a public telephone unit having a facility access restriction level via a public telephone network in response to a dialed telephone number designating said public telephone unit by utilizing a data structure comprising data defining access restriction control information stored relative to telephone number information, comprising the steps of:
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collecting a set of dialing digits from one of said subscriber stations designating said public telephone unit; accessing said data structure with said dialing digits to obtain accessed data; analyzing said accessed data from said data structure to determine the presence of access restriction control to said public telephone unit; comparing said facility access restriction level with said facility access authorization level of said one of said subscriber stations; and transmitting to said one of said subscriber stations a tone signal indicating that said public telephone unit is unaccessible to said one of said subscriber stations upon said facility access restriction level being greater than said facility access authorization level. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A system having
a plurality of switching nodes each interconnectable by a primary telephone network and a secondary telephone network and each switching node connected to a plurality of subscriber stations; -
means for collecting a first set of dialed digits from a first one of said plurality of subscriber stations connected to a first one of said switching nodes designating a second one of said plurality of subscriber stations connected to a second one of said switching nodes; means for decoding a first predetermined subset of said first set to determine the telephone network specified by said set of dialed digits; means for determining whether a communication path can be established through said secondary telephone network by interrogating a second subset of said first set and individual remaining digits of said first set upon said first predetermined subset specifying said primary telephone network; means for translating said first set to a second set of digits upon said communication path being interconnectable through said secondary telephone network; and means for establishing said communication path through said secondary telephone network using said second set of digits for interconnecting said first one of said subscriber stations with said second one of said subscriber stations. - View Dependent Claims (25, 26, 27, 28)
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29. A system to determine the presence of access restriction on communication from a plurality of subscriber stations each having a facility access authorization level and being interconnectable through a PBX to a public telephone unit having a facility access restriction level via a public telephone network, comprising:
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means for collecting a set of dialing digits from one of said subscriber stations; means for analyzing said set of dialing digits to determine the presence of access restriction control to said public telephone unit; means for comparing said facility access restriction level with said facility access authorization level of said one of said subscriber stations; and means for transmitting to said one of said subscriber stations a tone signal indicating that said public telephone unit is unaccessible to said one of said subscriber stations in response to said facility access restriction level being greater than said facility access authorization level. - View Dependent Claims (30, 31)
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Specification