Hybrid packet-switched and circuit-switched telephony system

• US 7,336,649 B1
• Filed: 12/20/1995
• Issued: 02/26/2008
• Est. Priority Date: 12/20/1995
• Status: Expired due to Fees

• Current Assignee: Verizon Patent and Licensing Incorporated (Verizon Communications Inc.)
• Original Assignee: Verizon Business Global LLC (Verizon Communications Inc.)
• Inventors: Huang, Lisheng
• Primary Examiner(s): Pham; Chi
• Assistant Examiner(s): TRAN, PHUC H
• Application Number:
  US08/575,433
• Time in Patent Office: 4,451 Days
• Field of Search: 370/352, 370/353, 370/354, 370/355, 370/356, 370/357, 370/401, 370/402, 370/465, 370/466, 370/467, 379/219, 379/220
• US Class Current: 370/352
• CPC Class Codes: H04L 12/6418 Hybrid transport
• CPC Class Codes: H04L 2012/563 Signalling, e.g. protocols, reference model
• CPC Class Codes: H04L 2012/5639 Tariffs or charging
• CPC Class Codes: H04L 2012/5671 Support of voice
• CPC Class Codes: H04L 2012/6424 Access arrangements
• CPC Class Codes: H04L 2012/6443 Network Node Interface, e.g. Routing, Path finding
• CPC Class Codes: H04L 2012/6472 Internet
• CPC Class Codes: H04L 2012/6475 N-ISDN, Public Switched Telephone Network [PSTN]
• CPC Class Codes: H04L 2012/6481 Speech, voice
• CPC Class Codes: H04L 2012/6486 Signalling Protocols
• CPC Class Codes: H04M 15/00 Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
• CPC Class Codes: H04M 15/55 for hybrid networks
• CPC Class Codes: H04M 15/56 for VoIP communications
• CPC Class Codes: H04M 2201/40 using speech recognition
• CPC Class Codes: H04M 2215/202 VoIP; Packet switched telephony
• CPC Class Codes: H04M 2215/2046 Hybrid network
• CPC Class Codes: H04M 3/428 Arrangements for placing incoming calls on hold
• CPC Class Codes: H04M 7/1245 where a network other than PSTN/ISDN interconnects two PSTN/ISDN networks
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

A hybrid telephony system with packet switching as well as circuit switching optimizes utilization of transport networks, and is accessible from any conventional telephone set. A call originating from a circuit-switched network is passed through a gateway computer to a backbone packet-switched network, and then through a second gateway computer to a second circuit-switched network where it terminates. The voice of both the originating party and the terminating party is converted to data packets by the near-end gateway computer and then converted back to voice by the far-end gateway computer. In an alternative scenario, the originating party uses a computer on the packet-switched network, which replaces the originating circuit-switched network and the originating computer. Powered by CPUs, DSPs, ASICs disks, telephony interfaces, and packet network interfaces, the gateway computers may have media conversion modules, speech processing modules and routing resolution modules, and are capable of translating telephony call signaling as well as voice between circuit-switched and packet-switched networks. Optionally, the gateway computers may also have analog trunking modules, MF and DTMF digit modules and special services modules, in order to support analog circuit-switched networks and secure telephone calls.

Claims

1. A telecommunications system comprising:

an originating circuit-switched network for providing originating signals in response to voice input,

an originating gateway computer for converting said originating signals into digital data packets,

a terminating gateway computer that converts said digital data packets into terminating signals,

a terminating circuit-switched network for providing voice output in response to said terminating signals, and

a packet-switched network for transmitting said digital data packets from said originating gateway computer to said terminating gateway computer, at least one of said originating gateway computer or said terminating gateway computer comprising a component for routing said digital data packets through said packet-switched network from said originating gateway computer to said terminating gateway computer;

wherein said terminating circuit-switched network is capable of providing first return signals to said terminating gateway computer in response to return voice input,

wherein said terminating gateway computer comprises a component for converting said first return signals into return packets of return digital data,

wherein at least one of said originating gateway computer or said terminating gateway computer comprises a component for routing said return packets through said packet-switched network from said terminating gateway computer to said originating gateway computer,

wherein said originating gateway computer comprises a component for converting said return packets into second return signals,

wherein said originating gateway computer comprises an originating buffer component for storing said return packets prior to conversion thereof into said second return signals, and

wherein said originating gateway computer further comprises a component for rearranging said stored return packets to maintain a proper packet order.

2. A telecommunications system according to claim 1, wherein said terminating gateway computer comprises a terminating buffer component for storing said digital packets prior to the conversion thereof into said terminating signals.

3. A telecommunications system according to claim 2, wherein said terminating gateway computer further comprises a component for rearranging said stored digital packets to maintain a proper packet order.

4. A telecommunications system according to claim 1, wherein said routing component provides said routing in response to dialed digits.

5. A telecommunication system according to claim 1, wherein said routing component provides said routing in response to spoken digits.

6. A telecommunications system according to claim 1, wherein at least one of said routing components comprises an address resolution logic and a network routing database implemented with a central processing unit.

7. A telecommunications system according to claim 1, wherein said originating gateway computer includes a component for providing a ring back tone or a busy tone to a telephone connected to said originating circuit-switched network.

8. A telecommunications system according to claim 1, wherein said originating circuit-switched network comprises at least one dedicated address for a caller, and a routing configuration from said dedicated address to said originating gateway computer, said routing configuration being such that a caller'"'"'s address and a destination address are passed to said originating gateway computer by the originating circuit-switched network and are routed to said terminating gateway computer by an originating routing component.

9. A telecommunications system comprising:

an originating gateway computer for providing digital packets corresponding to originating signals produced in response to voice input,

a gateway computer that converts said digital packets into terminating signals,

a circuit-switched network for providing voice output in response to said terminating signals, and

a packet-switched network for transmitting said digital packets from said originating gateway computer to said gateway computer, at least one of said originating gateway computer or said gateway computer comprising a component for routing said digital packets through said packet-switched network from said originating gateway computer to said gateway computer;

wherein said circuit-switched network is capable of providing first return signals to said gateway computer,

wherein said gateway computer comprises a component for converting said first return signals into return packets of return digital data,

wherein at least one of said originating gateway computer or said gateway computer comprises a component for routing said return packets through said packet-switched network from said gateway computer to said originating gateway computer,

wherein said originating gateway computer comprises a component for converting said return packets into second return signals,

wherein said originating network comprises a buffer component for storing said return packets prior to conversion thereof into said second return signals, and

wherein said originating network further comprises a component for rearranging said stored return packets to maintain a proper packet order.

10. A telecommunications system according to claim 9, wherein said gateway computer comprises a buffer component for storing said digital packets prior to the conversion thereof into said terminating voice signals.

11. A telecommunications system according to claim 10, wherein said gateway computer further comprises a component for rearranging said stored digital packets to maintain a proper packet order.

12. A telecommunications system according to claim 9, wherein said routing component provides said routing in response to data received from said gateway computer.

13. A telecommunications system according to claim 9, wherein said routing component provides said routing in response to a typed input from a computer keyboard.

14. A telecommunications method comprising:

providing originating digital packets for transmission from an originating gateway computer, said originating digital packets corresponding to originating signals produced in response to originating voice input;

routing said originating digital packets from said originating gateway computer to a gateway computer through a packet-switched network via an originating routing component in at least one of said originating gateway computer or said gateway computer;

converting said originating digital packets into terminating signals for transmission from said gateway computer;

transmitting said terminating signals through a circuit-switched network for providing terminating voice output in response to said terminating signals;

providing first return signals to said gateway computer in response to return voice input into said circuit-switched network;

converting said return signals into return digital packets of return digital data for transmission from said gateway computer;

routing said return digital packets through said packet-switched network from said gateway computer to said originating gateway computer using said originating routing component or another routing component in said originating gateway computer or said gateway computer;

storing the return digital packets in an originating buffer of the originating gateway computer prior to converting the return digital packets into second return signals;

rearranging the stored return digital packets to maintain a proper packet order;

and converting said return digital packets into the second return signals.

15. A telecommunications method according to claim 14, wherein said originating digital packets or said return digital packets or both said originating and return digital packets are routed using an address resolution logic and a network routing database implemented with a central processing unit.

16. A telecommunications method according to claim 14, further comprising providing a ring back or busy tone to a telephone connected to said originating gateway computer through an originating network in response to signaling from a component of said originating gateway computer.

17. A telecommunications method according to claim 14, wherein said gateway computer is a terminating gateway computer, and wherein said method further comprises:

providing a caller'"'"'s address and a callee'"'"'s address to said originating gateway computer,

authorizing a call between the caller and the callee using the caller'"'"'s address,

using the callee'"'"'s address for said routing of the originating digital packets from the originating gateway computer to the terminating gateway computer,

causing the terminating gateway computer to dial out to the callee through said circuit switched network using the callee'"'"'s address,

and causing the originating gateway computer to provide a return tone for advising the caller of a status of the call.

18. A telecommunications method according to claim 17 comprising the further step of causing the terminating gateway computer to transmit to the originating gateway computer via said packet-switched network a state change caused by the callee'"'"'s answering said call.

19. A telecommunications method according to claim 14, wherein a caller is associated with at least one dedicated address, and wherein said method further comprises:

routing a call in accordance with a routing configuration from a telephone at said dedicated address to said originating gateway computer,

passing said originating signals, the caller'"'"'s address and a destination address to the originating gateway computer in accordance with said routing configuration,

authorizing a call by checking account information of the caller though an internal data base of the originating gateway computer,

resolving a routing to said gateway computer using the destination address, and

causing the originating gateway computer to send a control message to the gateway computer along with said dedicated address and said destination address.

20. A telecommunications system comprising:

an originating circuit-switched network for providing originating signals in response to voice input,

an originating gateway computer for converting said originating signals into digital data packets,

a terminating gateway computer that converts said digital data packets into terminating signals,

a terminating circuit-switched network for providing voice output in response to said terminating signals, and

a packet-switched network for transmitting said digital data packets from said originating gateway computer to said terminating gateway computer, at least one of said originating gateway computer or said terminating gateway computer comprising a component for routing said digital data packets through said packet-switched network from said originating gateway computer to said terminating gateway computer;

wherein said terminating circuit-switched network is capable of providing first return signals to said terminating gateway computer in response to return voice input,

wherein said terminating gateway computer comprises a component for converting said first return signals into return packets of return digital data,

wherein at least one of said originating gateway computer or said terminating gateway computer comprises a component for routing said return packets through said packet-switched network from said terminating gateway computer to said originating gateway computer,

wherein said originating gateway computer comprises a component for converting said return packets into second return signals,

wherein said originating network comprises a buffer component for storing said return packets prior to conversion thereof into said second return signals,

wherein said originating network further comprises a component for rearranging said stored return packets to maintain a proper packet order, and

wherein at least one of said originating gateway computer or said terminating gateway computer comprises a time-division multiplexing bus interconnecting at least one digital trunk interface with a digital signal processor and an application-specific integrated circuit, and a system bus interconnecting said digital signal processor and said application-specific integrated circuit with a central processing unit and a random access memory.

21. A telecommunications method comprising:

providing originating digital packets for transmission from an originating gateway computer, said originating digital packets corresponding to originating signals produced in response to originating voice input;

routing said originating digital packets from said originating gateway computer to a gateway computer through a packet-switched network via an originating routing component in at least one of said originating gateway computer or said gateway computer;

converting said originating digital packets into terminating signals for transmission from said gateway computer;

transmitting said terminating signals through a circuit-switched network for providing terminating voice output in response to said terminating signals;

providing first return signals to said gateway computer in response to return voice input into said circuit-switched network;

converting said return signals into return digital packets of return digital data for transmission from said gateway computer;

routing said return digital packets through said packet-switched network from said gateway computer to said originating gateway computer using said originating routing component or another routing component in said originating gateway computer or said gateway computer;

storing the return digital packets in an originating buffer of the originating gateway computer prior to converting the return digital packets into second return signals;

rearranging the stored return digital packets to maintain a proper packet order;

converting said return digital packets into the second return signals;

estimating a unit charge for a call going through said gateway computer;

informing a caller providing said originating voice input about the unit charge; and

recording a payment method specified by the caller before providing said terminating voice output.

22. A method comprising:

receiving, at a first gateway device, a destination address of a called device from a calling device over a first circuit-switched network;

transmitting, in response to receiving the destination address, a connection request from the first gateway device to a second gateway device over a packet-switched network;

connecting, via the second gateway device, to the called device through a second circuit-switched network using the destination address;

establishing a call connection between the calling device and the called device through the first circuit-switched network, the packet-switched network, and the second circuit-switched network in response to the connecting;

receiving, at the second gateway device, first signals in response to voice input into the circuit-switched network from the called device;

converting, via the second gateway device, the first signals into first packets;

transmitting, via the second gateway device, the first packets to the first gateway device over the packet-switched network;

storing, at an origination buffer in the first gateway device, the first packets prior to converting the first packets into second signals;

rearranging, via the first gateway device, the stored first packets to maintain a proper packet order;

converting, via the first gateway device, the first packets into the second signals; and

transmitting, via the first gateway device, the second signals toward the calling device.

23. The method of claim 22, further comprising:

prompting, via the first gateway device, the calling device for a payment method; and

validating the payment method prior to transmitting the connection request to the second gateway device.