System and method for maximizing the use of bandwidth optimization techniques in voice-over-packet connections

• US 7,564,835 B1
• Filed: 11/06/2002
• Issued: 07/21/2009
• Est. Priority Date: 11/06/2002
• Status: Active Grant

• Current Assignee: Valtrus Innovations Limited (f/k/a Dolya Holdco 9 Limited) (Key Patent Innovations Limited)
• Original Assignee: 3Com Corporation (HP Inc.)
• Inventors: Tripathi, Anoop, Bekkerman, Boris, Grabelsky, David, Homeier, Michael
• Primary Examiner(s): Ni; Suhan
• Application Number:
  US10/289,948
• Time in Patent Office: 2,449 Days
• Field of Search: 370352-356, 709/202, 709/219, 709/223
• US Class Current: 370/352
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 65/103 in the network
• CPC Class Codes: H04L 65/1046 Call controllers; Call servers
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04M 7/1225 Details of core network interconnection arrangements
• CPC Class Codes: H04M 7/1255 where the switching fabric and the switching logic are decomposed such as in Media Gateway Control

Abstract

A system and method for maximizing the use of bandwidth optimization techniques in a voice-over-packet telephony system. In exemplary embodiments, the VOP system includes a plurality of telephones connected to a VOP telephony system. Upon receiving request to initiate a VOP connection, the end office switch connects to an originating softswitch for signaling functions and to an originating media gateway for transporting the media associated with the VOP connection. A connection information system accessible to the softswitch maintains connection information relating to media sessions between the originating media gateway and a plurality of candidate terminating media gateways. The connection information system may be accessed during connection initiation and advantageously used to determine whether there are nearly-simultaneously occurring and distinct media sessions having common endpoints such that bandwidth optimization techniques may be implemented.

Claims

1. A method for communicating voice signals on a packet-based network comprising the steps of:

initiating a telephone connection from a calling telephone to an originating media transporter, the originating media transporter being operable to communicate using at least one media combination function;

searching for at least one candidate terminating media transporter having at least one media session in progress with the originating media transporter and being operable to communicate using at least one media combination function;

selecting a terminating media transporter from the candidate terminating media transporters according to the number of media sessions in progress and the media combination function;

establishing a media session between the originating media transporter and the terminating media transporter; and

communicating data on the media session using at least one media combination function.

2. The method of claim 1 wherein the originating media transporter is an originating media gateway, the terminating media transporter is a terminating media gateway, the candidate media transporters are candidate terminating media gateways.

3. The method of claim 2 wherein the step of initiating the telephone connection comprises the steps of:

connecting the originating media gateway to the calling telephone using an originating softswitch; and

communicating voice signals between the calling telephone and the originating media gateway.

4. The method of claim 3 wherein the step of connecting the originating media gateway to the calling telephone comprises receiving trunk-line identification from the public switched telephone network (PSTN) to identify a media gateway connection and instructing the originating media gateway to process data on the media gateway connection.

5. The method of claim 3 further comprising the step of identifying a terminating softswitch having access to at least one media gateway that is operable to communicate using at least one media combination function.

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

sending a request for a softswitch identifier to a network device having at least one softswitch identifier identifying a potential terminating softswitch;

including a dialed number in the request for the softswitch; and

searching for at least one softswitch operable to connect to the dialed number.

7. The method of claim 6 further comprising the step of sending at least one softswitch identifier to the originating softswitch.

8. The method of claim 3 further comprising the steps of:

storing at least one softswitch identifier, each identifier identifying a potential terminating softswitch.

9. The method of claim 8 further comprising the step of assigning a priority to each softswitch identifier, the priority being based on a plurality of factors relating to using media combination functions.

10. The method of claim 8 further comprising the step of storing at least one media gateway identifier corresponding to at least one media gateway operable to perform at least one media combination function.

11. The method of claim 2 further comprising the steps of:

identifying a terminating softswitch; and

wherein the step of searching for at least one candidate terminating gateway comprises the step of receiving at least one candidate terminating media gateway identifier from the terminating Softswitch.

12. The method of claim 11 wherein the step of selecting from at least one media gateway identifiers corresponding to the terminating Softswitch comprises the steps of:

determining a number of sessions-in-progress with the originating media gateway for each of at least one media gateways corresponding to the terminating Softswitch; and

selecting the media gateway having the most number of sessions-in-progress as the terminating media gateway.

13. The method of claim 1 wherein the originating media transporter is an originating Internet Protocol (IP) media relay server, the terminating media transporter is a terminating IP media relay server.

14. A method for communicating voice signals on a packet-based network comprising the steps of:

initiating a telephone connection from a calling telephone to an originating media transporter, the originating media transporter being operable to communicate using at least one media combination function, wherein the originating media transporter is an originating Internet Protocol (IP) media relay server, wherein the step of initiating the telephone connection comprises the steps of;

requesting a data connection between the originating IP media relay server and the calling telephone using an originating softswitch, and communicating voice signals on the data connection between the calling telephone and the originating IP media relay server;

searching for at least one candidate terminating media transporter having at least one media session in progress with the originating media transporter and being operable to communicate using at least one media combination function, wherein the terminating media transporter is a terminating IP media relay server;

selecting a terminating media transporter from the candidate terminating media transporters according to the number of media sessions in progress and the media combination function;

establishing a media session between the originating media transporter and the terminating media transporter; and

communicating data on the media session using at least one media combination function.

15. The method of claim 14 further comprising the step of identifying a terminating softswitch having access to at least one IP media relay server that is operable to communicate using at least one media combination technique.

16. The method of claim 15 further comprising the steps of:

sending a request for a softswitch identifier to a network device having at least one softswitch identifier identifying a candidate terminating softswitch;

including a dialed number in the request for the softswitch; and

searching for at least one softswitch operable to connect to the dialed number.

17. The method of claim 16 further comprising the step of sending at least one softswitch identifier to the originating softswitch.

18. The method of claim 16 further comprising the steps of:

storing at least one softswitch identifier, each identifier identifying a candidate terminating softswitch.

19. The method of claim 18 further comprising the step of assigning a priority to each softswitch identifier.

20. The method of claim 18 further comprising the step of storing at least one IP media relay server identifier corresponding to at least one IP media relay server operable to perform at least one media combination function.

21. A method for communicating voice signals on a packet-based network comprising the steps of:

initiating a telephone connection from a calling telephone to an originating media transporter, the originating media transporter being operable to communicate using at least one media combination function, wherein the originating media transporter is an originating Internet Protocol (IP) media relay server;

searching for at least one candidate terminating media transporter having at least one media session in progress with the originating media transporter and being operable to communicate using at least one media combination function, wherein the terminating media transporter is a terminating IP media relay server;

selecting a terminating media transporter from the candidate terminating media transporters according to the number of media sessions in progress and the media combination function by selecting from at least one IP media relay server identifiers corresponding to a terminating softswitch;

establishing a media session between the originating media transporter and the terminating media transporter; and

communicating data on the media session using at least one media combination function.

22. The method of claim 21 wherein the step of selecting from at least one IP media relay server identifiers corresponding to the terminating Softswitch comprises the steps of:

determining a number of sessions-in-progress with the IP media relay server for each of at least one IP media relay servers corresponding to the terminating Softswitch; and

selecting the IP media relay server having the most number of sessions-in-progress with the IP media relay server as the terminating IP media relay server.

23. A system for communicating voice signals on a packet-based network comprising:

a first telephone connected to an originating media transporter;

an originating softswitch connected to the packet-based network, the originating softswitch operable to setup a packet portion of a telephone connection;

an originating media transporter accessible to the first softswitch, the originating media transporter connected to the first telephone via a digital pathway and to the packet-based network;

at least one candidate terminating softswitch connected to and operable to access at least one candidate terminating media transporter connected to a second telephone and to the packet-based network;

the originating softswitch being operable to access connection information relating to the at least one candidate terminating softswitch, wherein the connection information comprises a connection log identifying each media session to which the candidate terminating media transporter is a party and at least one party media transporter with which the candidate terminating media transporter is connected for each media session; and

a route determination function connected to the originating softswitch, the route determination function operable to identify a terminating softswitch from the at least one candidate terminating softswitch by analyzing the connection information.

24. The system of claim 23 wherein the originating media transporter is an originating media gateway, the terminating media transporter is a terminating media gateway:

the first telephone connects to the originating media gateway via a public-switched telephone network (PSTN) at a first end office switch;

the second telephone connects to the at least one candidate terminating media gateways via the PSTN telephone network on a second end office switch; and

the originating softswitch and the candidate terminating softswitches connect to the first and second end office switches via a PSTN signaling system.

25. The system of claim 24 further comprising a directory server communicatively connected to the originating softswitch and the candidate terminating softswitches, the directory server comprising:

a plurality of connection records relating to the at least one candidate terminating media gateway; and

a connection information process operable to retrieve connection information relating to the candidate softswitches based on the plurality of connection records and to provide the connection information in response to a connection information request.

26. The system of claim 23 wherein the connection information comprises a candidate softswitch list comprising at least one softswitch identifier identifying a candidate softswitch.

27. The system of claim 26 wherein the at least one softswitch identifier is ranked in order of best candidate softswitch.

28. The system of claim 23 wherein the connection information comprises a stream-multiplexing indicator for each candidate terminating media transporter to communicate whether the candidate terminating media transporter is capable of using bandwidth optimization.

29. The system of claim 28 wherein the connection information comprises at least one stream-multiplexing technique that each candidate terminating media transporter is able to use.

30. The system of claim 23 wherein the originating media transporter is an originating IP media relay server, the candidate terminating media transporters are candidate terminating IP media relays, and the terminating media transporter is a terminating IP media relay server, and wherein:

the first telephone connects to the originating IP media relay server via a first IP data connection; and

the second telephone connects to the at least one candidate terminating media IP media relay server via a second IP data connection.

31. The system of claim 30 further comprising a connection information system communicatively connected to the originating softswitch and the candidate terminating softswitches, the connection information system comprising:

a plurality of connection records relating to the at least one candidate terminating IP media relay server; and

a connection information process operable to retrieve connection information relating to the candidate softswitches based on the plurality of connection records and to provide the connection information in response to a connection information request.