Optimum routing of calls over the public switched telephone network and the internet

• US 6,324,280 B2
• Filed: 05/05/1998
• Issued: 11/27/2001
• Est. Priority Date: 05/05/1998
• Status: Expired due to Term

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Kozik, Jack, Dunn, James Patrick
• Primary Examiner(s): Matar, Ahmad
• Assistant Examiner(s): TIEU, BENNY QUOC
• Application Number:
  US09/072,809
• Publication Number:
  US 20010012355A1
• Time in Patent Office: 1,302 Days
• Field of Search: 379/230, 379/207-1-2, 379/219, 379/220.01, 379/221-1-2, 379/229, 379/90.01, 379/93.01, 379/93.09, 370/352, 370/389, 370/390, 370/392
• US Class Current: 379/230
• CPC Class Codes: H04L 12/6418 Hybrid transport
• 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 2012/6486 Signalling Protocols
• CPC Class Codes: H04L 61/00 Network arrangements, protocols or services for addressing or naming
• CPC Class Codes: H04L 61/10 of different types
• CPC Class Codes: H04M 7/0006 where voice calls cross both networks
• CPC Class Codes: H04M 7/0009 where voice calls remain entirely in the telephone network
• CPC Class Codes: H04Q 3/0025 Provisions for signalling

Abstract

A method and apparatus for selectively establishing a connection via a telephone network, or via the Internet. A network access switch decides whether to use the telephone network or the Internet. If connections are established using the Internet, the establishment of connection is controlled using existing CCS7 interoffice signaling messages. Advantageously, this permits most of the switching control software to be retained and allows the access switches to interface with the present array of operations support systems.

Claims

1. A method of establishing a voice connection between a subscriber connected to an originating switch, and a subscriber connected to a terminating switch, both switches having access to a telephone network and the Internet, comprising the steps of:

responsive to receipt of a request to establish a voice telephone connection for a call which can be established over the telephone network or the Internet, determining whether to establish the connection using a telephone network, or using the Internet;

if a decision is made to establish the connection using the telephone network, establishing the connection in accordance with procedures of the prior art;

if a decision is made to establish the connection using the Internet for transmitting an (IAM) initial address message over an inter-office signaling network to the terminating switch, the IAM including an Internet Protocol address of the originating switch;

responsive to receipt of said IAM, transmitting an acknowledgment message comprising an IP (Internet Protocol) address of said terminating switch over said interoffice signaling network;

establishing an Internet connection for carrying voice signals between said originating and said terminating switch, using said IP addresses; and

confirming establishment of said connection by another interoffice signaling message between the two switches sent over said inter-office signaling network;

wherein the determining step comprises the step of determining based on the relative traffic states of the Inernet and the telephone network, or based on dialed caller input, or based on caller class of service.

2. The method of claim 1 wherein said telephone network is a private network, and the step of establishing the connection in accordance with procedures of the prior art comprises the step of establishing a private network connection in accordance with procedures of the prior art for private network connections.

3. The method of claim 1 wherein said Internet connection is established over a private Internet Protocol network.

4. The method of claim 1 wherein the step of establishing an Internet connection comprises the step of:

checking that a call identifier returned in the acknowledgment message is the same as a call identifier sent in the IAM.

5. The method of claim 1 further comprising the steps of:

selecting an IP address in the switch transmitting said IAM;

selecting a different IP address in the switch transmitting said acknowledgment message; and

changing to said different IP address in the switch transmitting said IAM.

6. The method of claim 1 wherein said interoffice signaling network is a CCS7 network.

7. The method of claim 1, wherein said subscribers need not be provided with Internet service.

8. The method of claim 1, wherein at least one of said originating and terminating switches is a toll access switch.

9. In an originating network access switch, apparatus for controlling the establishment of a voice connection to a terminating network access switch, wherein both network access switches have access to a telephone network and the Internet, comprising:

means for accessing an interoffice signaling network;

means for establishing a voice connection to said telephone network;

means for establishing a connection to the Internet;

processor means for controlling transmission of messages over said interoffice signaling network, for receiving messages from said interoffice signaling network, and for controlling said means for establishing a connection in said originating network access switch;

said processor means, operative under program control for;

responsive to receipt of a request to establish a telephone connection for a call which can be established over the telephone network or the Internet, determining whether to establish the connection using a telephone network, or using the Internet;

wherein determining comprises determining based on the relative traffic states of the Internet and the telephone network, or based on dialed caller input, or based on caller class of service;

if a decision is made to establish the connection using the telephone network, establishing the connection in accordance with procedures of the prior art;

if a decision is made to establish the connection using the Internet, controlling transmission of an initial address message over said interoffice signaling network to the terminating access switch, the IAM (initial address message), including an Internet Protocol address of the network access switch;

responsive to receipt of an acknowledgment message from said terminating access switch, said acknowledgment message comprising an IP (Internet Protocol) address of said terminating access switch over said interoffice signaling network, controlling the establishment of an Internet connection for carrying voice signals between said originating network access switch and said terminating network access switch, using said IP addresses; and

confirming establishment of said connection by controlling transmission of another interoffice signaling message to said terminating access switch.

10. The apparatus of claim 9 wherein said means for accessing an interoffice signaling network comprises means for accessing a CCS7 network.

11. The apparatus of claim 9 wherein said means for establishing a voice connection to said telephone network comprises means for establishing a connection to a private telephone network.

12. The apparatus of claim 9, wherein a subscriber making said request to establish a telephone connection need not be provided with Internet service.

13. The apparatus of claim 9, wherein said network access switch comprising said apparatus is a toll access switch.

14. A method of establishing a voice connection between a subscriber connected to an originating switch, and a subscriber connected to a terminating switch, both switches having access to a telephone network and the Internet, comprising the steps of:

responsive to receipt of a request to establish a voice telephone connection for a call which can be established over the telephone network or the Internet, determining whether to establish the connection using a telephone network, or using the Internet;

if a decision is made to establish the connection using the telephone network, establishing the connection in accordance with procedures of the prior art;

if a decision is made to establish the connection using the Internet for transmitting an (IAM) initial address message over an inter-office signaling network to the terminating switch, the IAM including an Internet Protocol address of the originating switch;

responsive to receipt of said IAM, transmitting an acknowledgment message comprising an IP (Internet Protocol) address of said terminating switch over said interoffice signaling network;

establishing an Internet connection for carrying voice signals between said originating and said terminating switch, using said IP addresses; and

confirming establishment of said connection by another interoffice signaling message between the two switches sent over said inter-office signaling network;

wherein the determining step comprises the step of determining based on the relative traffic states of the Internet and the telephone network.

15. The method of claim 14, wherein the determining step further comprises the step of determining based on dialed caller input.

16. The method of claim 14, wherein the determining step further comprises the step of determining based on caller class of service.

17. In an originating network access switch, apparatus for controlling the establishment of a voice connection to a terminating network access switch, wherein both network access switches have access to a telephone network and the Internet, comprising:

means for accessing an interoffice signaling network;

means for establishing a voice connection to said telephone network;

means for establishing a connection to the Internet;

processor means for controlling transmission of messages over said interoffice signaling network, for receiving messages from said interoffice signaling network, and for controlling said means for establishing a connection in said originating network access switch;

said processor means, operative under program control for;

responsive to receipt of a request to establish a telephone connection for a call which can be established over the telephone network or the Internet, determining whether to establish the connection using a telephone network, or using the Internet;

wherein the determining comprises based on the relative traffic states of the Internet and the telephone network;

if a decision is made to establish the connection using the telephone network, establishing the connection in accordance with procedures of the prior art;

if a decision is made to establish the connection using the Internet, controlling transmission of an initial address message over said interoffice signaling network to the terminating access switch, the IAM (initial address message), including an Internet Protocol address of the network access switch;

responsive to receipt of an acknowledgment message from said terminating access switch, said acknowledgment message comprising an IP (Internet Protocol) address of said terminating access switch over said interoffice signaling network, controlling the establishment of an Internet connection for carrying voice signals between said originating network access switch and said terminating network access switch, using said IP addresses; and

confirming establishment of said connection by controlling transmission of another interoffice signaling message to said terminating access switch.

18. The apparatus of claim 17, wherein said determining further comprises determining based on caller input.

19. The apparatus of claim 17, wherein said determining further comprises determining based on caller class of service.