The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 2005
Filed:
Dec. 19, 2000
Pierre Couillaud, Belleville, CA;
Milos D. Pujic, Belleville, CA;
Craig S. Telke, Cary, NC (US);
Nortel Networks Limited, St. Laurent, CA;
Abstract
A method and apparatus are provided for establishing and maintaining a backhaul link over an Internet Protocol based network for transporting Layer 3 ISDN messages. A signalling gateway establishes a TCP connection to a Media Gateway Controller through the IP based network. The Layer 3 ISDN messages generated within an ISDN network attached to the IP based network are then transported between the signalling gateway and the Media Gateway Controller over the TCP connection. The integrity of the TCP connection is monitored using a heartbeat mechanism based on UDP packets. Both the signalling gateway and the Media Gateway Controller transmit UDP packets at regular intervals, and monitor for the arrival of UDP packets from the other device. If a provisioned number of consecutive UDP packets do not arrive from the other device, then a failure of the backhaul link is declared. The signalling gateway then attempts to re-establish the backhaul link.