METHOD AND APPARATUS FOR DETECTING DEVICES ON A LOCAL AREA NETWORK

• US 20110188407A1
• Filed: 02/03/2010
• Published: 08/04/2011
• Est. Priority Date: 02/03/2010
• Status: Active Grant

• Current Assignee: Vonage America LLC (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Vonage Network LLC (Telefonaktiebolaget LM Ericsson)
• Inventors: Ottur, Deepak, Aboughanaima, Mabrouk
• Granted Patent: US 8,305,933 B2
• Time in Patent Office: Days
• US Class Current: 370/254
• CPC Class Codes: H04L 61/2546 Arrangements for avoiding unnecessary translation
• CPC Class Codes: H04L 61/4511 using domain name system [DNS]
• CPC Class Codes: H04L 65/1059 End-user terminal functionalities specially adapted for real-time communication
• CPC Class Codes: H04L 65/1073 Registration or de-registration
• CPC Class Codes: H04L 67/51 Discovery or management thereof, e.g. service location protocol [SLP] or web services
• CPC Class Codes: H04M 7/0075 Details of addressing, directories or routing tables

Abstract

A method, apparatus, and system for discovering devices on a local area network. The method comprises sending a DNS request from a host networking element, receiving the DNS request at one or more devices, and responding to the host networking element with one or more DNS responses. The DNS request comprises one or more particular domain names. The one or more DNS responses comprise local network address information for the one or more VoIP devices. The apparatus comprises means for filtering a set of network traffic for a DNS request, means for responding to a DNS request with a local network address, and means for forwarding the DNS request to another device. The system comprises a computer for generating a DNS request for a particular domain, and one or more VoIP devices for receiving the DNS request and sending a DNS response to the computer with a local network address for the VoIP device.

Claims

1. A method for discovering Voice-over Internet Protocol (VoIP) devices on a network using domain name service (DNS) requests, the method comprising:

sending a DNS request from a host networking element, the DNS request comprising one or more particular domain names corresponding to a VoIP system;

receiving the DNS request at one or more VoIP devices; and

responding to the host networking element with one or more DNS responses, wherein the one or more DNS responses comprise local network address information for the one or more VoIP devices.

2. The method of claim 1, further comprising forwarding the DNS request to a next device on the computer network.

3. The method of claim 2, further comprising forwarding the DNS request until it reaches a network DNS server.

4. The method of claim 3, further comprising receiving a DNS response from the network DNS server.

5. The method of claim 4, wherein the responding step further comprises:

appending a local address for the VoIP device to the DNS response;

sending the DNS response to a previous requesting VoIP device within the network, such that each VoIP device that generates a forwarded DNS request appends a local network address for the corresponding VoIP device to the DNS response.

6. The method of claim 5, further comprising receiving the DNS response with each of the local network addresses of the one or more VoIP devices at the computer.

7. The method of claim 6, further comprising determining the presence of the one or more VoIP devices at the computer from the received DNS response.

8. The method of claim 2 wherein the DNS request comprises a list of one or more particular domain names and the receiving step further comprises:

receiving the list of one or more particular domain names;

sending a DNS response for a first element of the list with the local network address of the VoIP device to the host networking element; and

removing the first element of the list from the DNS request.

9. The method of claim 1, further using the host networking element to determine the presence of the one or more VoIP devices from the DNS responses.

10. The method of claim 1, wherein the DNS response further comprises a local address for the VoIP device.

11. The method of claim 1, wherein the local network address is an internet protocol (IP) address.

12. The method of claim 1, further comprising filtering the DNS request for the particular domain name corresponding to the VoIP system.

13. An apparatus for discovering Voice-over Internet Protocol (VoIP) devices on a computer network using domain name service (DNS) requests, the apparatus comprising:

means for filtering a set of network traffic for a DNS request;

means for responding to a DNS request with a local network address of the apparatus; and

means for forwarding the DNS request to another network device.

14. The apparatus of claim 13, further comprising means for filtering a DNS request for a particular domain name associated with a VoIP system.

15. The apparatus of claim 13, further comprising:

means for receiving a DNS response;

means for appending a local network address to the DNS response.

16. The apparatus of claim 13, wherein the DNS request comprises a list of one or more particular domain names and the apparatus further comprises:

means for generating a response to a first particular domain name in the list;

means for removing the first particular domain name from the list.

17. The apparatus of claim 13, further comprising:

means for resolving the DNS request into a local network address.

18. A system for discovering Voice-over Internet Protocol (VoIP) devices on a computer network using domain name service (DNS) requests, the system comprising:

a computer for generating a DNS request for a particular domain associated with a VoIP system; and

one or more VoIP devices for receiving the DNS request and sending a DNS response to the computer with a local network address for the VoIP device.

19. The system of claim 18, wherein the one or more VoIP devices forward the DNS request to another device connected to the computer network.

20. The system of claim 18, wherein the one or more VoIP devices filter the DNS request for the particular domain.