Access nodes in packet-based communications networks

• US 7,224,696 B2
• Filed: 06/10/2002
• Issued: 05/29/2007
• Est. Priority Date: 06/10/2002
• Status: Active Grant

• Current Assignee: Genband US LLC (Ribbon Communications, Inc.)
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Mitchell, Julian, Bouleros, George
• Primary Examiner(s): Chan; Wing
• Assistant Examiner(s): Wong; Warner
• Application Number:
  US10/165,900
• Publication Number:
  US 20030227905A1
• Time in Patent Office: 1,814 Days
• Field of Search: 370/389, 370/392, 370/475, 370/401, 370/410
• US Class Current: 370/401
• CPC Class Codes: H04L 61/00 Network arrangements, protocols or services for addressing or naming
• CPC Class Codes: H04L 61/2514 between local and global IP addresses
• CPC Class Codes: H04L 61/2564 for a higher-layer protocol, e.g. for session initiation protocol [SIP]
• CPC Class Codes: H04L 65/1043 Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
• CPC Class Codes: H04L 65/1101 Session protocols

Abstract

There is an increasing need for many media gateway nodes to be used in enterprise networks. These media gateway nodes are typically connected behind a network address translator (NAT) which connects the enterprise network to a public communications network. Communication between the access nodes and a service provider network, which is also connected to the public network, is needed to provide communications services to end users. However, as the number of media gateways increases problems arise associated with increased traffic, complexity and use of resources at the NAT and at the service provider network. A solution is presented whereby a node is used to represent the media gateway nodes in the enterprise network.

Claims

1. A node for representing a plurality of access nodes in a private communications network which is connected to a public communications network via an address translation node, said access nodes being arranged to facilitate a communications service provided from a service provider network which is connected to the public communications network,

said node being arranged to be connected in the private communications network such that it is intermediate between the address translation node on the one hand and the access nodes on the other hand and requiring only a single bind in the address translation node;

said node being arranged to receive in use at least some control signals from the service provider network and to forward those to one or more of the access nodes.

2. The node as claimed in claim 1 which is further arranged to receive in use at least some control signals from the access nodes and to forward those to the service provider network.

3. The node as claimed in claim 1 wherein each of the access nodes is arranged to support a plurality of endpoints and wherein the node comprises information about each of the access nodes and the associated endpoints.

4. The node as claimed in claim 3 which comprises a processor arranged to modify address information in the control signals on the basis of the information about the endpoints, access nodes and information about the service provider network.

5. The node as claimed in claim 2 which is arranged to receive all control signals from the access nodes that are intended for the service provider network and all control signals from the service provider network that are intended for the access nodes.

6. The node as claimed in claim 1 which provides a single point of contact by the service provider network for the access nodes.

7. The node as claimed in claim 1 which is integral with the address translation node.

8. The node as claimed in claim 1 which has an interface arranged to connect directly to the public communications network.

9. The node as claimed in claim 1 which is arranged to provide a secure connection between itself and the service provider network.

10. The node as claimed in claim 1 which comprises a processor arranged to generate control signals and to send those to one or more of the access nodes and/or the service provider network.

11. The node as claimed in claim 10 wherein the processor is arranged to send the generated control signals in anticipation of control signals received from either one or more access nodes or the service provider network.

12. The node as claimed in claim 1 which comprises a processor arranged to modify the control signals by adding information to enable one or more of the access nodes and the service provider network to communicate directly rather than via the node itself.

13. A communications network comprising a node as claimed in claim 1.

14. A communications network comprising:

a) a private communications network connected to a public communications network via an address translation node;

b) a service provider network connected to the public communications network;

c) a plurality of access nodes in the private communications network;

d) a node for representing the access nodes, said node being connected in the private communications network such that it is intermediate between the address translation node on the one hand and the access nodes on the other hand and requiring only a single bind in the address translation node;

said node being arranged to receive in use at least some control signals from the service provider network and to forward those to one or more of the access nodes.

15. A method of representing a plurality of access nodes in a private communications network which is connected to a public communications network via an address translation node, said access nodes being arranged to facilitate a communications service provided from a service provider network which is connected to the public communications network, said method comprising the steps of:

a) connecting a node in the private communications network such that it is intermediate between the address translation node on the one hand and the access nodes on the other hand and providing said node with only a single bind in the address translation node;

b) receiving control signals at the node from the service provider network and forwarding those to one or more of the access nodes.

16. A computer program stored on a computer readable medium and arranged to carry out the method of claim 15.