System, method, and apparatus for testing voice quality in a communication network

• US 7,218,895 B1
• Filed: 11/14/2002
• Issued: 05/15/2007
• Est. Priority Date: 11/14/2002
• Status: Expired due to Fees

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Raghavan, Jayasimha M.
• Primary Examiner(s): Milord; Marceau
• Application Number:
  US10/294,931
• Time in Patent Office: 1,643 Days
• Field of Search: 455/69, 455/67.3, 455/63.1, 455/428, 455/425, 455/67.11, 455/67.14, 370/401, 370/402, 370/351, 709/249, 709/223, 709/236, 380/249
• US Class Current: 455/67.13
• CPC Class Codes: H04L 43/50 Testing arrangements

Abstract

A method includes receiving one or more test signals at a first gateway from a second gateway. The method also includes comparing the one or more test signals to one or more expected signals. In addition, the method includes generating a score representing a voice quality supported by the first gateway on a path from the first gateway to the second gateway. The score is based at least partially on the comparison.

Claims

1. A method, comprising:

receiving one or more test signals at a first gateway from a second gateway;

comparing the one or more test signals to one or more expected signals; and

generating a score representing a voice quality supported by the first gateway on a path from the first gateway to the second gateway, the score based at least partially on the comparison.

2. The method of claim 1, further comprising communicating the one or more test signals from the first gateway to the second gateway, the second gateway operable to receive the one or more test signals and to communicate the one or more test signals back to the first gateway.

3. The method of claim 2, wherein the one or more test signals comprise one or more first test signals and the score comprises a first score;

and

further comprising;

receiving one or more second test signals from the second gateway; and

communicating the one or more second test signals to the second gateway, the second gateway operable to use the one or more second test signals to generate a second score.

4. The method of claim 1, wherein the one or more test signals comprise one or more tones generated and digitized at the first gateway.

5. The method of claim 4, wherein the one or more tones comprise three tones at frequencies of 104 Hertz, 1004 Hertz, and 2804 Hertz.

6. The method of claim 1, wherein the score comprises at least one of an International Telecommunication Union—

Telecommunications (ITU-T) Perceptual Speech Quality Measurement (PSQM) score and an ITU-T Perceptual Evaluation of Speech Quality (PESQ) score.

7. The method of claim 1, further comprising storing the score in a table.

8. The method of claim 7, wherein the table comprises a first table;

and further comprising communicating the score to the second gateway, the second gateway operable to update a second table with the score.

9. The method of claim 8, wherein:

the second gateway comprises one of a plurality of second gateways;

the table comprises a plurality of scores and a plurality of tags, each tag associated with one of the scores in the table; and

further comprising communicating a summary of the table to at least one of the second gateways, the summary comprising the tags from the table, the scores from the table, and a plurality of flags, each flag identifying whether an associated score has changed since a previous summary of the table was communicated to the at least one second gateway.

10. The method of claim 1, wherein receiving one or more test signals and comparing the one or more test signals to one or more expected signals comprises:

receiving a plurality of datagrams at the first gateway, the datagrams comprising one or more digitized signals;

depacketizing the datagrams; and

decoding the one or more digitized signals to generate the one or more test signals.

11. The method of claim 1, wherein the gateways comprise routers in a packet network.

12. Logic embodied on at least one computer readable medium and operable when executed to:

receive one or more test signals at a first gateway from a second gateway;

compare the one or more test signals to one or more expected signals; and

generate a score representing a voice quality supported by the first gateway on a path from the first gateway to the second gateway, the score based at least partially on the comparison.

13. The logic of claim 12, wherein the logic is further operable to communicate the one or more test signals from the first gateway to the second gateway, the second gateway operable to receive the one or more test signals and to communicate the one or more test signals back to the first gateway.

14. The logic of claim 13, wherein:

the one or more test signals comprise one or more first test signals and the score comprises a first score; and

the logic is further operable to;

receive one or more second test signals from the second gateway; and

communicate the one or more second test signals to the second gateway, the second gateway operable to use the one or more second test signals to generate a second score.

15. The logic of claim 12, wherein the one or more test signals comprise one or more tones generated and digitized at the second gateway.

16. The logic of claim 15, wherein the one or more tones comprise three tones at frequencies of 104 Hertz, 1004 Hertz, and 2804 Hertz.

17. The logic of claim 12, wherein the score comprises at least one of an International Telecommunication Union—

Telecommunications (ITU-T) Perceptual Speech Quality Measurement (PSQM) score and an ITU-T Perceptual Evaluation of Speech Quality (PESQ) score.

18. The logic of claim 12, wherein the logic is further operable to:

store the score in a first table; and

communicate the score to the second gateway, the second gateway operable to update a second table with the score.

19. The logic of claim 18, wherein:

the second gateway comprises one of a plurality of second gateways;

the first table comprises a plurality of scores and a plurality of tags, each tag associated with one of the scores in the table; and

the logic is further operable to communicate a summary of the first table to at least one of the second gateways, the summary comprising the tags from the first table, the scores from the first table, and a plurality of flags, each flag identifying whether an associated score has changed since a previous summary of the first table was communicated to the at least one second gateway.

20. An apparatus, comprising:

one or more processors collectively operable to;

receive one or more test signals at a first gateway from a second gateway;

compare the one or more test signals to one or more expected signals; and

generate a score representing a voice quality supported by the first gateway on a path from the first gateway to the second gateway, the score based at least partially on the comparison; and

a memory operable to store the score.

21. The apparatus of claim 20, wherein the one or more processors are further collectively operable to communicate the one or more test signals from the first gateway to the second gateway, the second gateway operable to receive the one or more test signals and to communicate the one or more test signals back to the first gateway.

22. The apparatus of claim 21, wherein:

the one or more test signals comprise one or more first test signals and the score comprises a first score; and

the one or more processors are further collectively operable to;

receive one or more second test signals from the second gateway; and

communicate the one or more second test signals to the second gateway, the second gateway operable to use the one or more second test signals to generate a second score.

23. The apparatus of claim 20, wherein the one or more test signals comprise one or more tones generated and digitized at the second gateway.

24. The apparatus of claim 23, wherein the one or more tones comprise three tones at frequencies of 104 Hertz, 1004 Hertz, and 2804 Hertz.

25. The apparatus of claim 20, wherein the score comprises at least one of an International Telecommunication Union—

Telecommunications (ITU-T) Perceptual Speech Quality Measurement (PSQM) score and an ITU-T Perceptual Evaluation of Speech Quality (PESQ) score.

26. The apparatus of claim 20, wherein the one or more processors are further collectively operable to:

store the score in a first table in the memory; and

communicate the score to the second gateway, the second gateway operable to update a second table with the score.

27. The apparatus of claim 20, wherein:

the second gateway comprises one of a plurality of second gateways;

the first table comprises a plurality of scores and a plurality of tags, each tag associated with one of the scores in the table; and

the one or more processors are further collectively operable to communicate a summary of the first table to at least one of the second gateways, the summary comprising the tags from the first table, the scores from the first table, and a plurality of flags, each flag identifying whether an associated score has changed since a previous summary of the first table was communicated to the at least one second gateway.

28. A method, comprising:

receiving one or more test signals at a first gateway from a second gateway;

communicating the one or more test signals back to the second gateway; and

allowing the second gateway to generate a score representing a voice quality supported by the second gateway on a path from the second gateway to the first gateway.

29. The method of claim 28, wherein the one or more test signals comprise one or more first test signals and the score comprises a first score;

and

further comprising;

generating one or more second test signals at the first gateway;

communicating the one or more second test signals to the second gateway;

receiving the one or more second test signals at the first gateway from the second gateway;

comparing the one or more second test signals to one or more expected signals; and

generating a second score representing a voice quality supported by the first gateway on the path from the first gateway to the second gateway, the score based at least partially on the comparison.

30. The method of claim 28, wherein the one or more test signals comprise three tones at frequencies of 104 Hertz, 1004 Hertz, and 2804 Hertz.

31. The method of claim 28, wherein the score comprises at least one of an International Telecommunication Union—

Telecommunications (ITU-T) Perceptual Speech Quality Measurement (PSQM) score and an ITU-T Perceptual Evaluation of Speech Quality (PESQ) score.

32. The method of claim 28, wherein the second gateway is operable to store the score in a first table;

and

further comprising receiving the score from the second gateway and updating a second table with the score.

33. The method of claim 28, wherein:

the first gateway comprises one of a plurality of first gateways and the score comprises a plurality of scores;

the second gateway stores the scores in a first table, the first table also comprising a plurality of tags, each tag associated with one of the scores in the table; and

further comprising;

receiving a summary of the first table at one or more of the first gateways from the second gateway, the summary comprising the tags from the first table, the scores from the first table, and a plurality of flags, each flag identifying whether an associated score has changed since a previous summary of the first table was communicated to the one or more of the first gateways; and

updating a second table at the one or more first gateways with any score having an associated flag showing that the score has changed since the previous summary of the first table was communicated to the one or more first gateways.

34. Logic embodied on at least one computer readable medium and operable when executed to:

receive one or more test signals at a first gateway from a second gateway;

communicate the one or more test signals back to the second gateway; and

allow the second gateway to generate a score representing a voice quality supported by the second gateway on a path from the second gateway to the first gateway.

35. The logic of claim 34, wherein the one or more test signals comprise one or more first test signals and the score comprises a first score;

and

the logic is further operable to;

generate one or more second test signals at the first gateway;

communicate the one or more second test signals to the second gateway;

receive the one or more second test signals at the first gateway from the second gateway;

compare the one or more second test signals to one or more expected signals; and

generate a second score representing a voice quality supported by the first gateway on the path from the first gateway to the second gateway, the score based at least partially on the comparison.

36. The logic of claim 34, wherein the one or more test signals comprise three tones at frequencies of 104 Hertz, 1004 Hertz, and 2804 Hertz.

37. The logic of claim 34, wherein the score comprises at least one of an International Telecommunication Union—

Telecommunications (ITU-T) Perceptual Speech Quality Measurement (PSQM) score and an ITU-T Perceptual Evaluation of Speech Quality (PESQ) score.

38. The logic of claim 34, wherein:

the second gateway is operable to store the score in a first table; and

the logic is further operable to receive the score from the second gateway and update a second table with the score.

39. The logic of claim 34, wherein:

the first gateway comprises one of a plurality of first gateways and the score comprises a plurality of scores;

the second gateway stores the scores in a first table, the first table also comprising a plurality of tags, each tag associated with one of the scores in the table; and

the logic is further operable to;

receive a summary of the first table at one or more of the first gateways from the second gateway, the summary comprising the tags from the first table, the scores from the first table, and a plurality of flags, each flag identifying whether an associated score has changed since a previous summary of the first table was communicated to the one or more of the first gateways; and

update a second table at the one or more first gateways with any score having an associated flag showing that the score has changed since the previous summary of the first table was communicated to the one or more first gateways.

40. A system, comprising:

one or more processors collectively operable to;

receive one or more test signals at a first gateway from a second gateway;

communicate the one or more test signals back to the second gateway; and

allow the second gateway to generate a score representing a voice quality supported by the second gateway on a path from the second gateway to the first gateway; and

a memory operable to store the score.

41. The system of claim 40, wherein the one or more test signals comprise one or more first test signals and the score comprises a first score;

and

the one or more processors are further collectively operable to;

generate one or more second test signals at the first gateway;

communicate the one or more second test signals to the second gateway;

receive the one or more second test signals at the first gateway from the second gateway;

compare the one or more second test signals to one or more expected signals; and

generate a second score representing a voice quality supported by the first gateway on the path from the first gateway to the second gateway, the score based at least partially on the comparison.

42. The system of claim 40, wherein the test signals comprise three tones at frequencies of 104 Hertz, 1004 Hertz, and 2804 Hertz.

43. The system of claim 40, wherein the score comprises at least one of an International Telecommunication Union—

Telecommunications (ITU-T) Perceptual Speech Quality Measurement (PSQM) score and an ITU-T Perceptual Evaluation of Speech Quality (PESQ) score.

44. The system of claim 40, wherein:

the second gateway is operable to store the score in a first table; and

the one or more processors are further collectively operable to receive the score from the second gateway and update a second table with the score.

45. The system of claim 40, wherein:

the first gateway comprises one of a plurality of first gateways and the score comprises a plurality of scores;

the second gateway stores the scores in a first table, the first table also comprising a plurality of tags, each tag associated with one of the scores in the table; and

the one or more processors are further collectively operable to;

receive a summary of the first table at one or more of the first gateways from the second gateway, the summary comprising the tags from the first table, the scores from the first table, and a plurality of flags, each flag identifying whether an associated score has changed since a previous summary of the first table was communicated to the one or more of the first gateways; and

update a second table at the one or more first gateways with any score having an associated flag showing that the score has changed since the previous summary of the first table was communicated to the one or more first gateways.

46. A system, comprising:

a first gateway operable to generate one or more first test signals;

a second gateway operable to receive the one or more first test signals from the first gateway and to communicate the one or more first test signals to the first gateway;

the first gateway also operable to receive the one or more first test signals from the second gateway, compare the one or more first test signals to one or more first expected signals, and generate a first score representing a voice quality supported by the first gateway on a path from the first gateway to the second gateway;

the second gateway also operable to generate one or more second test signals;

the first gateway is further operable to receive the one or more second test signals from the second gateway and to communicate the one or more second test signals to the second gateway;

the second gateway further operable to receive the one or more second test signals, compare the one or more second test signals to one or more second expected signals, and generate a second score representing a voice quality supported by the second gateway on the path from the second gateway to the first gateway; and

the first and second gateways further operable to communicate and exchange the first and second scores.

47. A system, comprising:

means for generating one or more test signals at a first gateway;

means for communicating the one or more test signals to a second gateway;

means for receiving the one or more test signals from the second gateway;

means for comparing the one or more test signals to one or more expected signals; and

means for generating a score representing a voice quality supported by the first gateway on a path from the first gateway to the second gateway.