Radiotelephone communications system with direct access to interoffice telephone trunk circuits and interface therefor

• US 5,544,227 A
• Filed: 06/07/1995
• Issued: 08/06/1996
• Est. Priority Date: 08/31/1993
• Status: Expired due to Term

• Current Assignee: Bellsouth Intellectual Property Corporation (AT&T, Inc.)
• Original Assignee: BellSouth Corporation (AT&T, Inc.)
• Inventors: Comer, Edward I., Blust, Stephen M., Sandidge, Jere T.
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): TROST IV, WILLIAM GEORGE
• Application Number:
  US08/474,522
• Time in Patent Office: 426 Days
• Field of Search: 379/58, 379/59, 379/60, 379/63, 455/33.1, 455/54.1, 455/56.1, 455/33.2, 455/54.2, 455/11.1, 455/15, 455/17
• US Class Current: 455/426.1
• CPC Class Codes: H04W 84/14 WLL [Wireless Local Loop]; RLL [Radio Local Loop]
• CPC Class Codes: H04W 84/16 WPBX [Wireless Private Branch Exchange]

Abstract

An interface circuit for use with a radiotelephone communications system in which the interface circuit is adapted to interface a trunk circuit serving a telephone switching system with a radiotelephone of the system using the trunk circuit supervision and signaling so that the switching system and trunk circuit have direct access to the radiotelephone system.

Claims

1. A telephone system comprising:

a radiotelephone communications system including;

one or more radiotelephones;

one or more base stations for radio communicating with one or more of said radiotelephones;

a radiotelephone switching office for selectively connecting calls between radiotelephones via said base stations;

a further system including;

one or more first telephone stations;

a telephone switching system for coupling calls to and from said one or more first telephone stations;

a telephone trunk circuit used with said telephone switching system, said telephone trunk circuit for connecting to an interoffice telecommunications facility, said telephone trunk circuit utilizing supervision for effecting call origination and/or termination and signalling for effecting transfer of call routing information;

an interface circuit for interfacing a first of said radiotelephones with said telephone trunk circuit so that calls are routed between said radiotelephone communication system and said first telephone stations of said further system through said telephone switching system comprising;

first means adapted to interact with said supervision for interfacing said supervision with said first radiotelephone for effecting a call origination and/or termination; and

second means adapted to interact with said signalling for interfacing said signalling with said first radiotelephone for effecting transfer of call routing information;

said further system further including;

a public switched telephone network;

one or more second telephone stations connected to said public switched telephone network;

said public switched telephone network being coupled to said radiotelephone switching office so that calls are coupled between a second telephone station and a radiotelephone served by the radiotelephone communications system or between a second telephone station and said first telephone station served by the radiotelephone communications system via said first of said radiotelephones; and

said radiotelephone communications system further comprising;

routing correlator (RC) means having a correlation table for correlating the routing numbers of said first telephone stations with the routing number of said first radiotelephone interfaced by said interface circuit; and

said radiotelephone switching office and said RC cooperating such that calls from said second telephone stations routed to said radiotelephone switching office are routed by said radiotelephone switching office to said RC to determine from said correlation table whether the routed call is to a routing number of a first telephone station correlated to said interfaced first radiotelephone and if so routing said call to said interfaced radiotelephone and transmitting said routing number to said interfaced radiotelephone and said interface.

2. A telephone system in accordance with claim 1 wherein:

said supervision for call origination and/or termination comprises one or more of;

E&

M signaling;

loop reverse battery signaling;

duplex signaling;

single frequency signaling;

digital multiplexed signaling;

labeled messages;

or CCS, SS7 or ISDN messages;

and said signaling for effecting transfer of call routing information comprises one or more of;

multi-frequency R1;

multi-frequency R2;

DTMF;

dial pulse;

labeled messages;

or CCS, SS7 or ISDN messages.

3. A telephone system in accordance with claim 2 wherein:

said supervision includes;

a state change of supervision to indicate start of routing information transfer; and

a state change of supervision for answer supervision.

4. A telephone system in accordance with claim 2 wherein:

said telephone trunk circuit comprises one or more of;

a two-wire telephone trunk circuit;

a four-wire telephone trunk circuit;

a labeled message based telephone trunk circuit;

or a CCS, SS7 or ISDN telephone trunk circuit.

5. A telephone system in accordance with claim 1 wherein:

said telephone switching system comprises one or more of;

a PBX, a private or public central office, a private or public access tandem switch or a radiotelephone switching office.

6. A method of operating a telephone system comprising:

providing a radiotelephone communications system including;

one or more radiotelephones;

one or more base stations for radio communicating with one or more of said radiotelephones;

a radiotelephone switching office for selectively connecting calls between radiotelephones via said base stations;

providing a further system including;

one or more first telephone stations;

a telephone switching system for coupling calls to and from said one or more first telephone stations;

a telephone trunk circuit used with said telephone switching system, said telephone trunk circuit for connecting to an interoffice telecommunications facility, said telephone trunk circuit utilizing supervision for effecting call origination and/or termination and signalling for effecting transfer of call routing information;

interfacing a first of said radiotelephones with said telephone trunk circuit so that calls are routed between said radiotelephone communication system and said first telephone stations of said further system through said telephone switching system comprising;

first means adapted to interact with said supervision for interfacing said supervision with said first radiotelephone for effecting a call origination and/or termination; and

second means adapted to interact with said signalling for interfacing said signalling with said first radiotelephone for effecting transfer of call routing information;

said further system further including;

a public switched telephone network;

one or more second telephone stations connected to said public switched telephone network;

said public switched telephone network being coupled to said radiotelephone switching office so that calls are coupled between a second telephone station and a radiotelephone served by the radiotelephone communications system or between a second telephone station and said first telephone station served by the radiotelephone communications system via said first of said radiotelephones; and

said radiotelephone communications system further comprising;

routing correlator (RC) means having a correlation table for correlating the routing numbers of said first telephone stations with the routing number of said first radiotelephone interfaced by said interface circuit; and

said radiotelephone switching office and said RC cooperating such that calls from said second telephone stations routed to said radiotelephone switching office are routed by said radiotelephone switching office to said RC to determine from said correlation table whether the routed call is to a routing number of a first telephone station correlated to said interfaced first radiotelephone and if so routing said call to said interfaced radiotelephone and transmitting said routing number to said interfaced radiotelephone and said interface.

7. A method in accordance with claim 6 wherein:

said supervision for call origination and/or termination comprises one or more of;

E&

M signaling;

loop reverse battery signaling;

duplex signaling;

single frequency signaling;

digital multiplexed signaling;

labeled messages;

or CCS, SS7 or ISDN messages;

and said signaling for effecting transfer of call routing information comprises one or more of;

multi-frequency R1;

multi-frequency R2;

DTMF;

dial pulse;

labeled messages;

or CCS, SS7 or ISDN messages.

8. A method in accordance with claim 7 wherein:

said supervision includes;

a state change of supervision to indicate start of routing information transfer; and

a state change of supervision for answer supervision.

9. A method in accordance with claim 7 wherein:

said telephone trunk circuit comprises one or more of;

a two-wire telephone trunk circuit;

a four-wire telephone trunk circuit;

a labeled message based telephone trunk circuit;

or a CCS, SS7 or ISDN telephone trunk circuit.

10. A method in accordance with claim 6 wherein:

said telephone switching system comprises one or more of a;

PBX, a private or public central office, a private or public access tandem switch or a radiotelephone switching office.