System and method for evaluating the quality of service in an IP telephony network using call forwarding

• US 7,388,946 B1
• Filed: 09/02/2003
• Issued: 06/17/2008
• Est. Priority Date: 09/02/2003
• Status: Active Grant

• Current Assignee: Level 3 Communications LLC (Lumen Technologies, Inc.)
• Original Assignee: Level 3 Communications LLC (Lumen Technologies, Inc.)
• Inventors: Santhana, Vivek, Mussman, Harry
• Primary Examiner(s): Tran; Quoc
• Application Number:
  US10/653,561
• Time in Patent Office: 1,750 Days
• Field of Search: 379/1.01, 379/1.03, 379/9, 379/15.01, 379/24, 379/28, 379/32.01, 379/32.02, 379/22.04, 379/27.02, 379/27.03, 379/27.08, 379/29.01, 370/216, 370/218, 370/229, 370/241, 370/247, 370/252, 370/352
• US Class Current: 379/15.01
• CPC Class Codes: H04L 41/0681 Configuration of triggering conditions
• CPC Class Codes: H04L 41/22 comprising specially adapted graphical user interfaces [GUI]
• CPC Class Codes: H04L 41/5003 Managing SLA; Interaction between SLA and QoS
• CPC Class Codes: H04L 41/5087 wherein the managed service relates to voice services management of VoIP services H04M7/0081
• CPC Class Codes: H04L 43/50 Testing arrangements
• CPC Class Codes: H04M 3/323 for the arrangements providing the connection (test connection, test call, call simulation)
• 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

Abstract

Methods and systems are described for verifying communications paths on a network. A test signal is forwarded between network nodes to evaluate quality of service in an IP telephony system. A test call is generated by a call initiator, communicated to one or more network devices, and forwarded from the one or more network devices to a call recipient according to address information associated with the test call. During the test call, a test signal is communicated between the call initiator, the call recipient, and the one or more network devices. The quality of service of the IP telephony network is evaluated according to characteristics associated with the test signal.

Claims

1. A computerized method for evaluating the quality of service in an IP telephony network, the method comprising:

communicating a test call from a call initiator via a call manager to a network device;

determining whether the test call should be forwarded to one or more other network devices prior to forwarding the test call to the call manager;

if the test call should not be forwarded to one or more other network devices, forwarding the test call from the network device to a call recipient via the call manager according to address information associated with the test call;

communicating, during the test call, a test signal between the call initiator and the call recipient; and

evaluating the quality of service between the call initiator and the call recipient according to characteristics associated with the test signal received by the call recipient.

2. The method of claim 1, wherein the test call comprises a VoIP call.

3. The method of claim 1, wherein the test signal comprises a digital audio file.

4. The method of claim 1, wherein the call initiator comprises a component of a device selected from the group consisting of:

a voice over IP terminal, a gateway, call manager, and a private branch exchange.

5. The method of claim 1, wherein the network device comprises a device selected from the group consisting of:

a voice over IP terminal, a gateway, a call manager, and a private branch exchange.

6. The method of claim 1, wherein the network device comprises a VoIP PBX, and comprising setting the VoIP PBX to forward the test call according to the associated address information.

7. The method of claim 1, wherein the network devices comprises a PBX associated with a gateway, and comprising setting the PBX to forward the test call according to the associated address information.

8. The method of claim 6, comprising setting the VoIP PBX to forward the test call to a predetermined address.

9. The method of claim 6, comprising setting the VoIP PBX to forward the test call back to the call initiator, wherein the call initiator and call recipient are components within one test device.

10. The method of claim 6, wherein communicating the test call comprises communicating the test call with associated address information.

11. The method of claim 10, comprising the VoIP PBX retrieving the associated address information from the test call.

12. The method of claim 1, wherein the call recipient comprises a component of a device selected from the group consisting of:

a voice over IP terminal, a gateway, call manager, and a private branch exchange.

13. The method of claim 1, wherein the address information associated with the test call comprises an IP address.

14. The method of claim 1, wherein the address information associated with the test call comprises an E.164 address.

15. The method of claim 1, wherein the test call is forwarded from a first network device to at least one other network device prior to being forwarded to the call recipient.

31. The method of claim 1, wherein forwarding the test call comprises forwarding the test call back to a device comprising both the call initiator and the call recipient.

32. The method of claim 1, wherein communicating the test call from the call initiator and evaluating the quality of service are performed by the same device.

33. The method of claim 1, further comprising generating an alarm based on a threshold associated with one or more of test call setup failure and the quality of service.

34. The method of claim 1, further comprising retrieving the address information from a data store storing endpoint address data identifying endpoint devices that the call initiator is to test.

16. A computerized method for evaluating the quality of service in an IP telephony network loop, the method comprising:

communicating a test call from a call initiator to a first network device;

forwarding the test call from the first network device to one or more additional network devices according to address information associated with the test signal;

forwarding the test call from the one or more additional network devices back to the call initiator according to address information associated with the test signal;

communicating, during the test call, a test signal between the call initiator, the first network device, and the one or more additional network devices; and

evaluating, according to characteristics associated with the test signal, the quality of service in the communication loop comprising the call initiator, the first network device, and the one or more additional network devices.

35. The computerized method of claim 16, further comprising decoding the header information to determine whether to forward the test call to one of the one or more additional network devices or to forward the test call back to the call initiator.

36. The computerized method of claim 16, wherein communicating the test call from the call initiator and evaluating the quality of service are performed by the same device.

37. The computerized method of claim 16, further comprising generating an alarm based on a threshold associated with one or more of test call setup failure and the quality of service.

38. The computerized method of claim 16, further comprising retrieving the address information from a data store storing endpoint address data identifying endpoint devices that the call initiator is to test.

17. A system for evaluating the quality of service in an IP telephony network, the system comprising:

a call initiator, wherein the call initiator is programmed to communicate a test call to a network device;

a network device, wherein the network device is programmed to forward the test call to a call recipient according to address information associated with the test call, wherein the network device is further programmed to determine whether header information in the test call indicates that the test call should be forwarded back to the call initiator; and

a call recipient, wherein the call recipient is programmed to evaluate the quality of service between the call initiator and the call recipient according to characteristics associated with a test signal communicated, during the test call, between the call initiator and the call recipient.

18. The system of claim 17, wherein the test signal comprises a digital audio file.

19. The system of claim 17, wherein the test call comprises a VoIP call.

20. The system of claim 17, wherein the call initiator comprises a component of a device selected from the group consisting of:

a voice over IP terminal, a gateway, call manager, and a private branch exchange.

21. The system of claim 17, wherein a network device comprises a device selected from the group consisting of:

a voice over IP terminal, a gateway, a call manager, and a private branch exchange.

22. The system of claim 17, wherein a network device comprises a VoIP PBX set to forward the test call according to the associated address information.

23. The system of claim 17, wherein the network device comprises a PBX associated with a gateway, wherein the PBX is set to forward the test call according to the associated address information.

24. The system off claim 22, wherein the VoIP PBX is set to forward the test call to a predetermined address.

25. The system of claim 22, wherein the VoIP PBX is set to forward the test call back to the call initiator, wherein the call initiator and call recipient are components within one test device.

26. The system of claim 17, wherein the call recipient comprises a component of a device selected from the group consisting of:

a voice over IP terminal, a gateway, call manager, and a private branch exchange.

27. The system of claim 17, wherein the address information associated with the test call comprises an IP address.

28. The system of claim 17, wherein the address information associated with the test call comprises an E.164 address.

29. The system of claim 17, wherein the first network device is programmed to forward the test call to at least one other network device prior to the test call being forwarded to the call recipient.

30. The system of claim 17, wherein the call initiator is programmed to evaluate the quality of service between the call initiator and the call recipient according to characteristics associated with a test signal communicated, during the test call, between the call initiator and the call recipient.

39. The system of claim 17, wherein the network device decodes the header information in the test call to determine whether to forward the test call to an additional network device or to forward the test call back to the call initiator.

40. The system of claim 17, further comprising a call manager configured to evaluate quality of service in a loop of network devices including the network device and one or more additional network devices.

41. The system of claim 17, wherein the call recipient is further programmed to generate an alarm based on a threshold associated with one or more of test call setup failure and the quality of service.

42. The system of claim 17, further comprising a data store storing endpoint address data identifying endpoints that the call initiator is to test.

43. A computerized method for evaluating the quality of service in an IP telephony network, the method comprising:

at a test call manager, generating a test call having header information identifying one or more network devices to be tested;

sending the test call to a first network device to be tested;

determining, based on the header information, whether the test call should be sent to one or more other network devices to be tested prior to being sent back to the call manager;

sending the test call back to the call manager if the header information does not indicate one or more other network devices that the test call should be sent to prior to being sent to the call manager; and

otherwise, sending the test call to at least one of the one or more network devices indicated in the header according to address information in the test call.

44. The computerized method of claim 43, further comprising, after sending the test call to one or more other network devices indicated in the header, sending the test call back to the call manager to form a loop of network devices for testing quality of service.