Method and apparatus for selecting an internet/PSTN changeover server for a packet based phone call

• US 6,628,760 B2
• Filed: 03/30/2001
• Issued: 09/30/2003
• Est. Priority Date: 03/14/1997
• Status: Expired due to Term

• Current Assignee: ITXC IP Holdings SARL (Tata Sons Pvt Ltd.)
• Original Assignee: ITXC INCORPORATED (Tata Sons Pvt Ltd.)
• Inventors: Mirashrafi, Mojtaba, Zuber, Mark D., Elliott, John D., Keeler, Kenneth L., Taylor, George L., Simon, Al J., Buondonno, Michael F., Pirkl, Keith A., Sponaugle, Jeffrey B.
• Primary Examiner(s): Hoosain, Allan
• Application Number:
  US09/823,211
• Publication Number:
  US 20010012357A1
• Time in Patent Office: 914 Days
• Field of Search: 379/88.01, 379/88.07, 379/88.13, 379/88.17, 379/88.18, 379/201.01, 379/201.02, 379/211.02, 379/212.01, 379/265.09, 379/900, 379/902, 379/908, 379/88.19, 379/88.2
• US Class Current: 379/88.17
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/401 wherein the services involve a main real-time session and one or more additional parallel real-time or time sensitive sessions, e.g. white board sharing or spawning of a subconference
• CPC Class Codes: H04L 65/4061 Push-to services, e.g. push-to-talk or push-to-video
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04M 3/42323 PBX's with CTI arrangements
• CPC Class Codes: H04M 3/42348 Location-based services which utilize the location information of a target
• CPC Class Codes: H04M 3/5191 interacting with the Internet
• CPC Class Codes: H04M 3/527 Centralised call answering arrangements not requiring operator intervention
• CPC Class Codes: H04M 7/003 Click to dial services
• CPC Class Codes: H04M 7/006 Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42
• CPC Class Codes: H04M 7/1205 where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
• CPC Class Codes: Y10S 379/90 Internet, e.g. Internet phone, webphone, internet-based telephony
• CPC Class Codes: Y10S 379/908 Multimedia

Abstract

A method and apparatus for establishing a voice call to a PSTN extension on behalf of a networked client computer, and routing the voice call off of the network, is provided. In a first embodiment, the apparatus comprises a storage medium having stored therein a plurality of programming instructions for implementing a set of communication services for facilitating establishment of the voice call to the PSTN extension, and an execution unit, coupled to the storage medium, for executing the plurality of programming instructions. The set of communication services include services for soliciting inputs from one or more other apparatuses on one or more operating characteristics associated with the establishment and support of the voice call to the PSTN extension, and selecting one of the solicited apparatuses to place the voice call to the PSTN extension.

Claims

1. A computer system comprising:

a storage medium having stored therein a plurality of programming instructions; and

an execution unit, coupled to the storage medium to execute the plurality of programming instructions to provide a set of communication services including a service for soliciting inputs from one or more other computer systems on one or more operating characteristics associated with establishment and support of a voice call from a client computer coupled to a packet switched network to a circuit switched network extension, and selecting one of the solicited computer systems to place the voice call through a circuit switched network to the circuit switched network extension on behalf of the client computer.

2. The computer system of claim 1, wherein the inputs on one or more operating characteristics include an estimate of a number of intermediaries required to connect the client computer to the computer system.

3. The computer system of claim 1, wherein the inputs on one or more operating characteristics include an estimate for toll charges associated with placing the voice call from the selected computer system to the circuit switched network extension.

4. The computer system of claim 1, wherein the communication services calculate corresponding call metrics based on the solicited inputs for the solicited computer systems, and use the calculated call metrics to make the computer system selection.

5. The computer system of claim 1, wherein the communication services further include telephony services for cooperating with telephony equipment coupled to the computer system.

6. The computer system of claim 1, wherein the execution unit further executes the programming instructions to implement web server functions.

7. The computer system of claim 1, wherein the execution unit further executes the programming instructions to implement internet service provider functions.

8. A method for selecting a computer system to route a packet based phone call, destined for a circuit switched network extension that does not employ pulse code modulation (PCM), off a packet switched network and onto the circuit switched network, the method comprising:

(a) soliciting inputs by a computer system from a plurality of other computer systems on one or more operating characteristics associated with routing the packet based phone call off the packet switched network and onto the circuit switched network at other computer systems; and

(b) selecting by the soliciting computer system, one of the solicited computer systems to route the packet based phone call off the packet switched network and onto the circuit switched network based on the solicited operating characteristics.

9. The method of claim 8, wherein said soliciting input comprises soliciting from each computer system an estimate on a number of intermediaries required to connect the client computer to the computer system.

10. The method of claim 8, wherein said soliciting input comprises soliciting from each of the solicited computer systems a toll charge estimate for placing a voice call from the particular computer system to the non-PCM circuit switched network extension.

11. The method of claim 8, wherein said selecting comprises calculating corresponding call metrics based on the solicited inputs for the responding computer systems, and use the calculated call metrics to make the selection.

12. A computer system comprising:

a storage medium having stored therein a plurality of programming instructions; and

an execution unit, coupled to the storage medium, to execute the plurality of programming instructions to provide a set of communication services including a service to establish and facilitate a voice call from a client computer coupled to a packet switched network to a circuit switched network extension on behalf of the client computer,

wherein the communication services include services to receive solicitation inputs from a soliciting computer system on one or more operating characteristics associated with the establishment and support of the voice call to the circuit switched network extension, the soliciting computer system also soliciting other computer systems for their operating characteristics associated with the establishment and support of the voice call, and

wherein the communication services further include services to determine the solicited one or more operating characteristics, and to respond to the solicitation with the determined one or more operating characteristics to enable the soliciting computer system to determine from the solicited operating characteristics which of the solicited computer systems is in a better position to place the voice call to the circuit switched network extension through a circuit switched network for the client computer.

13. The computer system of claim 12, wherein the inputs on one or more operating characteristics include an estimate of a number of intermediaries required to connect the client computer to the computer system.

14. The computer system of claim 13, wherein the estimate of the number of intermediaries required to connect the client computer to the computer system is derived from execution of a trace route function.

15. The computer system of claim 12, wherein the inputs on one or more operating characteristics include an estimate for toll charges associated with placing the voice call from the computer system to the non-PCM circuit switched network extension.

16. The computer system of claim 15, wherein the toll rate estimate is retrieved from a toll rate table.

17. The computer system of claim 16, wherein the storage medium further having stored therein the toll rate table.

18. The computer system of claim 16, wherein the toll rate table is located at a signal control point (SCP) of the circuit switched network.

19. The computer system of claim 18, wherein the toll rate table located at the SCP is accessed by the computer system with an out-of-band signaling protocol.

20. The computer system of claim 19, wherein the out-of-band signaling protocol is a Signaling System 7 (SS7) standard protocol.

21. The computer system of claim 12, wherein the communication services calculate corresponding call metrics based on the solicited inputs for the responding computer systems, and use the calculated call metrics to make the computer system selection.

22. The computer system of claim 12, wherein the communication services further include telephony services for cooperating with telephony equipment coupled to the computer system.

23. The computer system of claim 12, wherein the execution unit further executes the programming instructions to implement web server functions.

24. The computer system of claim 12, wherein the execution unit further executes the programming instructions to implement internet service provider functions.

25. A method for selecting a computer system to route a packet based phone call, destined for a circuit switched network extension, off a packet switched network and onto the circuit switched network, on behalf of a client computer, the method comprising:

(a) receiving by a computer system solicitation inputs from a soliciting computer system for one or more operating characteristics associated with routing the packet based phone call off the packet switched network and onto the circuit switched network on behalf of the client computer, the soliciting computer system also soliciting other computer systems for their operating characteristics associated with routing the packet based phone call;

(b) determining by the solicited computer system the solicited one or more operating characteristics; and

(c) responding by the solicited computer system to said soliciting computer system with the determined one or more operating characteristics, to enable the soliciting computer system to determine which of the solicited computer systems is in a better position to route the packet based phone call to the circuit switched network extension through the circuit switched network on behalf of the client computer.

26. The method of claim 25, wherein the one or more operating characteristics include an estimate on a number of intermediaries required to connect the client computer to the computer system.

27. The method of claim 26, wherein said determining comprises executing a trace route function.

28. The method of claim 25, wherein the one or more operating characteristics include a toll charge estimate for placing a voice call from the computer system to the non-PCM circuit switched network extension.

29. The method of claim 28, wherein said determining comprises accessing a toll rate table.

30. The method of claim 29, wherein the toll rate table is located locally.

31. The method of claim 29, wherein the toll rate table is located at a signal control point (SCP) of the circuit switched network.

32. The method of claim 31, wherein said selecting further comprises sending and receiving a plurality of out-of-band signaling protocol packets.

33. The method of claim 32, wherein the out-of-band signaling protocol is a Signaling System 7 (SS7) standard protocol.