Method and apparatus for Voice-over-IP call recording

• US 7,548,539 B2
• Filed: 12/19/2005
• Issued: 06/16/2009
• Est. Priority Date: 03/08/2005
• Status: Active Grant

• Current Assignee: AudioCodes, Inc. (Audiocodes Limited)
• Original Assignee: AudioCodes, Inc. (Audiocodes Limited)
• Inventors: Zeng, Lujia, Dutt, Abhay, Lan, Dongping, Howell, Donald, Sampath, Murali, Mzili, Aziz, Chen, Pin Lo, Kouretas, Stephen
• Primary Examiner(s): Jagannathan; Melanie
• Application Number:
  US11/311,557
• Publication Number:
  US 20060203807A1
• Time in Patent Office: 1,275 Days
• Field of Search: None
• US Class Current: 370/356
• 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 63/30 for supporting lawful interception, monitoring or retaining of communications or communication related information circuit switched telephony call monitoring H04M3/2281
• CPC Class Codes: H04M 3/2281 Call monitoring, e.g. for law enforcement purposes; Call tracing; Detection or prevention of malicious calls
• 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

A method of obtaining information associated with a Voice over Internet Protocol (VoIP) communication session includes tapping the computer network passively to obtain signaling information and media information in a first format, separating the signaling information from the media information, transcoding the media information to a second format, and storing the transcoded media information in the second format. The media information includes data, voice, audio, and/or video information. A system adapted to obtain information associated with a VoIP communication session on a computer network includes a tapping device to passively tap the computer network to obtain signaling information and media information in a first format, a processing device adapted to transcode the media information from the first format to a second format and separate the signaling information from the media information, and a storage device adapted to store the transcoded media information in the second format.

Claims

1. A method of passively recording information associated with a VoIP communication session on a computer network comprising:

tapping, by a tapping device, the computer network passively to obtain signaling information and media information without establishing a voice session with a recording device, the media information being in a first format;

separating the signaling information from the media information;

transcoding the media information to a second format; and

storing the transcoded media information in the second format, thereby monitoring information associated with a VoIP communication session on a computer network without requiring modification to the computer network and without impairing operation of the computer network, the first and second formats being digital formats.

2. A method of obtaining information associated with a VoIP communication session on a computer network as defined by claim 1, wherein the media information comprises at least one of data, voice, audio, and video information.

3. A method of obtaining information associated with a VoIP communication session on a computer network as defined by claim 1, wherein the first format comprises at least one of G.711, A-law PCM, mu-law PCM, linear PCM, G.723.1, G.727, G.729a, G.729b, GSM610, GSM-MS, NetCoder, and Oki-ADPCM.

4. A method of obtaining information associated with a VoIP communication session on a computer network as defined by claim 1, wherein the second format comprises at least one of G.711, A-law PCM, mu-law PCM, linear PCM, G.723.1, G.727, G.729a, G.729b, GSM610, GSM-MS, NetCoder, and Oki-ADPCM.

5. A method of obtaining information associated with a VoIP communication session on a computer network as defined by claim 1, further comprising:

determining whether an internet protocol (IP) address associated with the media information matches an IP address associated with the communication session; and

discarding the media information in response to determining that the IP address associated with the media information does not match the IP address associated with the communication session.

6. A method of obtaining information associated with a VoIP communication session on a computer network as defined by claim 1, wherein the information is organized in packets.

7. A method of obtaining information associated with a VoIP communication session on a computer network as defined by claim 1, wherein the information in the second format requires less storage space than the information in the first format.

8. A method of obtaining information associated with a VoIP communication session on a computer network as defined by claim 1, wherein the network comprises an internet protocol (IP)-based network.

9. A method of obtaining information associated with a VoIP communication session on a computer network as defined by claim 1, wherein the network comprises at least one of a local area network (LAN) and a wide area network (WAN).

10. A method of obtaining information associated with a VoIP communication session on a computer network as defined by claim 1, wherein the information is associated with a plurality of communication sessions.

11. A method of obtaining information associated with a VoIP communication session on a computer network as defined by claim 1, further comprising:

retrieving the stored information; and

replaying the retrieved information in response to a request by a user.

12. A method of obtaining information associated with a VoIP communication session on a computer network as defined by claim 1, wherein tapping the network passively to obtain media information in a first format further comprises tapping the network to obtain information flowing in an upstream and a downstream direction on the network.

13. A method of obtaining information associated with a VoIP communication session on a computer network as defined by claim 1, wherein the signaling information comprises control information associated with the media information.

14. A system to passively record information associated with a VoIP communication session on a computer network comprising:

a tapping device to passively tap the computer network to obtain signaling information and media information without establishing a voice session with a recording device, the media information being in a first format;

a processing device to transcode the media information from the first format to a second format, the processing device separating the signaling information from the media information; and

a storage device to store the transcoded media information in the second format, thereby monitoring information associated with a VoIP communication session on a computer network without requiring modification to the computer network and without impairing operation of the computer network, the first and second formats being digital formats.

15. A system to obtain information associated with a VoIP communication session on a computer network as defined by claim 14, wherein the media information comprises at least one of data, voice, audio, and video information.

16. A system to obtain information associated with a VoIP communication session on a computer network as defined by claim 14, wherein the first format comprises at least one of G.711, A-law PCM, mu-law PCM, linear PCM, G.723.1, G.727, G.729a, G.729b, GSM610, GSM-MS, NetCoder, and Oki-ADPCM.

17. A system to obtain information associated with a VoIP communication session on a computer network as defined by claim 14, wherein the second format comprises at least one of G.711, A-law PCM, mu-law PCM, linear PCM, G.723.1, G.727, G.729a, G.729b, GSM610, GSM-MS, NetCoder, and Oki-ADPCM.

18. A system to obtain information associated with a VoIP communication session on a computer network as defined by claim 14, wherein the processing device determines whether an internet protocol (IP) address associated with the media information matches an IP address associated with the communication session, the processing device discarding the media information in response to determining that the IP address associated with the media information does not match the IP address associated with the communication session.

19. A system to obtain information associated with a VoIP communication session on a computer network as defined by claim 14, wherein the information is organized in packets.

20. A system to obtain information associated with a VoIP communication session on a computer network as defined by claim 14, wherein the information in the second format requires less storage space than the information in the first format.

21. A system to obtain information associated with a VoIP communication session on a computer network as defined by claim 14, wherein the network comprises an internet protocol (IP)-based network.

22. A system to obtain information associated with a VoIP communication session on a computer network as defined by claim 14, wherein the network comprises at least one of a local area network (LAN) and a wide area network (WAN).

23. A system to obtain information associated with a VoIP communication session on a computer network as defined by claim 14, wherein the information is associated with a plurality of communication sessions.

24. A system to obtain information associated with a VoIP communication session on a computer network as defined by claim 14, wherein the processing device retrieves the stored information, the processing device replaying the retrieved information in response to a request by a user.

25. A system to obtain information associated with a VoIP communication session on a computer network as defined by claim 14, wherein the passive tapping device obtains information flowing in an upstream and a downstream direction on the network.

26. A system to obtain information associated with a VoIP communication session on a computer network as defined by claim 14, wherein the signaling information comprises control information associated with the media information.

27. A method of passively recording information associated with a VoIP communication session on a computer network comprising:

tapping, by a tapping device, the computer network passively to obtain signaling information and media information without establishing a voice session with a recording device, the media information being in a first format;

separating the signaling information from the media information;

transcoding the media information to a second format; and

storing the transcoded media information in the second format, thereby monitoring information associated with a VoIP communication session on a computer network without requiring modification to the computer network and without impairing operation of the computer network, the first format comprising at least one of G.711, A-law PCM, mu-law PCM, linear PCM, G.723.1, G.727, G.729a, G.729b, GSM610, GSM-MS, NetCoder, and Oki-ADPCM, the second format comprising at least one of G.711, A-law PCM, mu-law PCM, linear PCM, G.723.1, G.727, G.729a, G.729b, GSM610, GSM-MS, NetCoder, and Oki-ADPCM, the first and second formats being digital formats.

28. A method of passively recording information associated with a VoIP communication session on a computer network comprising:

tapping, by a tapping device, the computer network passively to obtain signaling information and media information without establishing a voice session with a recording device, the media information being in a first format;

separating the signaling information from the media information;

transcoding the media information to a second format;

storing the transcoded media information in the second format, thereby monitoring information associated with a VoIP communication session on a computer network without requiring modification to the computer network and without impairing operation of the computer network;

determining whether an internet protocol (IP) address associated with the media information matches an IP address associated with the communication session, the first and second formats being digital formats; and

discarding the media information in response to determining that the IP address associated with the media information does not match the IP address associated with the communication session.

29. A system to passively record information associated with a VoIP communication session on a computer network comprising:

a tapping device to passively tap the computer network to obtain signaling information and media information, the media information being in a first format without establishing a voice session with a recording device;

a processing device to transcode the media information from the first format to a second format, the processing device separating the signaling information from the media information; and

a storage device to store the transcoded media information in the second format, thereby monitoring information associated with a VoIP communication session on a computer network without requiring modification to the computer network and without impairing operation of the computer network, the first format comprising at least one of G.711, A-law PCM, mu-law PCM, linear PCM, G.723.1, G.727, G.729a, G.729b, GSM610, GSM-MS, NetCoder, and Oki-ADPCM, the second format comprising at least one of G.711, A-law PCM, mu-law PCM, linear PCM, G.723.1, G.727, G.729a, G.729b, GSM610, GSM-MS, NetCoder, and Oki-ADPCM, the first and second formats being digital formats.

30. A system to passively record information associated with a VoIP communication session on a computer network comprising:

a tapping device to passively tap the computer network to obtain signaling information and media information, the media information being in a first format without establishing a voice session with a recording device;

a processing device to transcode the media information from the first format to a second format, the processing device separating the signaling information from the media information; and

a storage device to store the transcoded media information in the second format, thereby monitoring information associated with a VoIP communication session on a computer network without requiring modification to the computer network and without impairing operation of the computer network, the processing device determining whether an internet protocol (IP) address associated with the media information matches an IP address associated with the communication session, the processing device discarding the media information in response to determining that the IP address associated with the media information does not match the IP address associated with the communication session, the first and second formats being digital formats.