Method and apparatus for monitoring calls over a session initiation protocol network

• US 20020075880A1
• Filed: 12/20/2000
• Published: 06/20/2002
• Est. Priority Date: 12/20/2000
• Status: Active Grant

• Current Assignee: RPX Clearinghouse LLC (RPX Corporation)
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Dolinar, Larry, Lyell, Mike
• Granted Patent: US 6,870,817 B2
• Time in Patent Office: Days
• US Class Current: 370/401
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04L 65/65 Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
• CPC Class Codes: H04L 65/70 Media network packetisation
• 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

An apparatus and method are formed to add a header to a data packet being transmitted into a data packet network for a communication that is to be monitored. The header causes the data packet to be routed to a specified system node that contains monitoring equipment. The specified system node then forwards the data packet to an exit node. The header is stripped prior to exiting the data packet network to a destination system or device so that there will be no indication that the call was monitored. In an alternate embodiment, a duplicate packet is created wherein one packet is routed to a specified destination for the communication while the other data packet is routed to a node containing monitoring equipment.

Claims

1. A gateway system for triggering the monitoring of data packets that form a communication in a data packet network, comprising:

a storage device for storing computer instructions for generating and transmitting data packets having a select header, which select header includes communication monitoring parameters;

a network port for receiving and transmitting the data packets; and

a processor coupled to communicate with the storage device and coupled to the output port wherein the processor generates the data packets with the select header and then transmits them through the network port.

2. The gateway system of claim 1 wherein the select header includes address information of a remote node containing monitoring equipment.

3. The gateway system of claim 1 wherein the select header includes an indication of the type of monitoring that is take place.

4. The gateway system of claim 3 wherein the type is signaling information only.

5. The gateway system of claim 3 wherein the type is payload information only.

6. The gateway system of claim 1 wherein the select header includes a header stripping parameter that defines, at least partially, when a communication monitoring header is to be stripped from the data packet.

7. The gateway system of claim 1 wherein the select header is appended to the original data packet to cause the original data packet to be transmitted to a specified external node containing monitoring equipment.

8. The gateway system of claim 1 wherein the select header is appended to a duplicate of the original data packet to cause the duplicate data packet to be transmitted to a specified external node containing monitoring equipment.

9. A method in a gateway device to a data packet network for triggering communication monitoring for a plurality of data packets that form a communication, the method comprising:

determining whether a data packet is part of a communication that is to be monitored;

appending a communication monitoring system (CMS) header to the data packet; and

routing the data packet with the appended (CMS) header to a node containing monitoring equipment.

10. The method of claim 9 wherein the determining step includes determining whether a source of the data packet is one that is to be monitored.

11. The method of claim 9 wherein the determining step includes determining whether a destination of the data packet is one that is to be monitored.

12. The method of claim 9 further including the step of determining whether payload information is to be monitored in addition to monitoring signaling information.

13. The method of claim 9 further comprising the step of duplicating the data packet and adding the CMS header to only one of the original or duplicate data packets.

14. The method of claim 9 wherein the CMS header includes an address of a node containing monitoring equipment.

15. The method of claim 9 wherein the CMS header includes an indication of the type of monitoring that is to occur.

16. The method of claim 9 wherein the CMS header includes a header stripping parameter.

18. The method of claim 17 wherein the method is performed in a gateway device.

19. The method of claim 17 wherein the method is performed in a portal to the data packet network.

20. The method of claim 17 wherein the one of the original and duplicated data packets that is forwarded to the node containing monitoring equipment is modified to including monitoring parameters within a header.

17. A method for routing data packets in a data packet network, comprising:

determining that an original data packet is part of a communication that is to be monitored;

duplicating the original data packet and forwarding one of the original and the duplicated data packets to a node containing monitoring equipment; and

forwarding the other of the original and the duplicated data packets to a specified destination.