Telecommunication network that reduces tandeming of compressed voice packets

• US 6,021,136 A
• Filed: 07/30/1997
• Issued: 02/01/2000
• Est. Priority Date: 07/30/1997
• Status: Expired due to Fees

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Chu, Thomas P., Civanlar, Seyhan, Bharucha, Behram H.
• Primary Examiner(s): Kizou, Hassan
• Assistant Examiner(s): Pezzlo, John
• Application Number:
  US08/903,090
• Time in Patent Office: 916 Days
• Field of Search: 370/465, 370/468, 370/477, 370/271, 370/466, 370/260, 370/235, 370/236, 370/410, 370/352, 370/331, 370/395, 370/522, 370/521, 370/401, 370/268, 370/225, 704/228
• US Class Current: 370/477
• CPC Class Codes: H04L 12/6418 Hybrid transport
• CPC Class Codes: H04L 2012/5619 Network Node Interface, e.g. tandem connections, transit switching
• CPC Class Codes: H04L 2012/563 Signalling, e.g. protocols, reference model
• CPC Class Codes: H04L 2012/5656 using the AAL2
• CPC Class Codes: H04L 2012/5663 Support of N-ISDN
• CPC Class Codes: H04L 2012/5671 Support of voice
• CPC Class Codes: H04L 2012/6427 Subscriber Access Module; Concentrator; Group equipment
• 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 7/0072 Speech codec negotiation H04L65/1069 takes precedence
• CPC Class Codes: H04M 7/1245 where a network other than PSTN/ISDN interconnects two PSTN/ISDN networks
• CPC Class Codes: H04Q 11/04 for time-division multiplexing H04Q11/0001 takes precedence
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

A telecommunication network establishes a telephone call from a first location that generates compressed voice packets to a second location. The telecommunication network includes a plurality of switches, a first interworking function ("IWF") coupled to the first location and coupled to a first switch of the plurality of switches, a second IWF coupled to the second location and coupled to a second switch of the plurality of switches, and a network database coupled to said first switch. When a telephone call is initiated from the first location, the first switch receives signaling information from the first location. The first switch then queries the network database based on the signaling information and determines whether the second location uses compressed voice packets based on the query. Finally, the first switch establishes a connection between the first IWF and the second IWF if it is determined that the second location uses compressed voice packets. The connection bypasses the plurality of switches, and therefore reduces tandeming in the network.

Claims

1. A telecommunication network for establishing a telephone call from a first location that generates compressed voice packets to a second location, said telecommunication network comprising:

a plurality of network switches;

a first interworking function (IWF) coupled to the first location and coupled to a first network switch of said plurality of network switches;

a second IWF coupled to the second location and coupled to a second network switch of said plurality of network switches; and

a network database coupled to said first network switch;

wherein said first network switch is programmed to;

receive signaling information from the first location;

query said network database based on the signaling information;

determine whether the second location uses compressed voice packets based on the query; and

establish a connection between said first IWF and said second IWF if it is determined that the second location uses compressed voice packets, wherein said connection bypasses said plurality of network switches.

2. The telecommunication network of claim 1, wherein the telephone call comprises transmitting the compressed voice packets from the first location to the second location on an Asynchronous Transfer Mode (ATM) circuit.

3. The telecommunication network of claim 2, wherein the connection comprises an ATM Adaption Layer-2 (AAL2) channel connection.

4. The telecommunication network of claim 1, wherein said first IWF decompresses voice packets received from the first location if it is determined that the second location does not use compressed voice packets.

5. The telecommunication network of claim 1, wherein said second IWF compresses voice packets received from said second network switch.

6. The telecommunication network of claim 1, wherein said first IWF and said second IWF comprise packet relay switches.

7. The telecommunication network of claim 1, wherein the first location comprises end user equipment and a third IWF coupled to said first IWF.

8. The telecommunication network of claim 1, wherein the connection is a direct connection between said first IWF and said second IWF.

9. The telecommunication network of claim 1, further comprising:

a plurality of IWFs;

wherein the connection is routed through at least one of the plurality of IWFs.

10. The telecommunication network of claim 1, wherein said first IWF is controlled by one of said plurality of network switches and said second IWF is controlled by another one of said plurality of network switches.

11. A method of initiating a telephone call from a first location that generates compressed voice packets to a second location over a telecommunication network that comprises a plurality of network switches and a first and second interworking function (IWF), said method comprising the steps of:

(a) receiving signaling information from the first location;

(b) querying a telecommunication network database based on the signaling information;

(c) determining whether the second location uses compressed voice packets based on the query; and

(d) establishing a connection between the first IWF and the second IWF if it is determined that the second location uses compressed voice packets, wherein said connection bypasses the plurality of network switches.

12. The method of claim 11, wherein the telephone call comprises transmitting the compressed voice packets from the first location to the second location on an Asynchronous Transfer Mode (ATM) circuit.

13. The method of claim 12, wherein the connection comprises an ATM Adaption Layer-2 (AAL2) channel connection.

14. The method of claim 11, wherein the first IWF decompresses voice packets received from the first location if it is determined that the second location does not use compressed voice packets.

15. The method of claim 11, wherein the second IWF compresses voice packets received from the second network switch.

16. The method of claim 11, wherein the first IWF and the second IWF comprise packet relay switches.

17. The method of claim 11, wherein the first location comprises end user equipment and a third IWF coupled to the first IWF.

18. The method of claim 11, wherein the telecommunication network comprises a plurality of IWFS, step (d) comprising the step of:

routing the connection through at least one of the plurality of IWFs.

19. A telecommunication network for carrying at least one compressed voice packet from a first location to a second location, said network comprising:

a plurality of interworking functions (IWFs);

a plurality of network switches;

a network database coupled to one or more of said network switches;

means for receiving signaling information from the first location;

means for querying said network database based on the signaling information;

means for determining whether the second location uses compressed voice packets based on the query; and

means for establishing a connection between a pair of said plurality of IWFs if it is determined that the second location uses compressed voice packets, wherein said connection bypasses said plurality of network switches.

20. The telecommunication network of claim 19, wherein the compressed voice packet is carried on an Asynchronous Transfer Mode (ATM) circuit.

21. The telecommunication network of claim 20, wherein said connection comprises an ATM Adaption Layer-2 (AAL2) channel connection.

22. The telecommunication network of claim 19, wherein said plurality of IWFs comprise packet relay switches.

23. The telecommunication network of claim 19, wherein the first location comprises end user equipment coupled to an IWF.

24. The telecommunication network of claim 19, wherein said connection is a direct connection between said pair of said plurality of IWFs.

25. The telecommunication network of claim 19, wherein said connection is routed through one or more intermediate IWFs between said pair of IWFs.

26. The telecommunication network of claim 25, wherein said pair of IWFs and said one or more intermediate IWFs are each controlled by at least one of said plurality of network switches.

27. The telecommunication network of claim 25, wherein said pair of IWFs are controlled by at least one of said plurality of network switches, and said one or more intermediate IWFs are not controlled by said plurality of network switches.

28. The telecommunication network of claim 19, wherein said plurality of IWFs and said plurality of network switches are part of a Public Switched Telephone Network ("PSTN").

29. A telecommunication network for transmitting a first compressed voice packet from a first location to a second location, said network comprising:

a first path for transmitting compressed voice packets from the first location to the second location;

a second path for transmitting uncompressed voice packets from the first location to the second location;

means for transmitting the first voice packet over said first path if said second location uses compressed voice packets; and

means for transmitting the first voice packet over said second path if said second location uses uncompressed voice packets.