Transport mechanism for ISDN backhaul over IP

Details Transport mechanism for ISDN backhaul over IP Transport mechanism for ISDN backhaul over IP

2005-01-04

2005-01-04

Chin, Wellington (Department: 2664)

Multiplex communications

Pathfinding or routing

Combined circuit switching and packet switching

C370S384000, C370S524000

Reexamination Certificate

active

06839344

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.

REFERENCES:
patent: 6178173 (2001-01-01), Mundwiler et al.
patent: 6728748 (2004-04-01), Mangipudi et al.
R. Stewart et al.; “Stream Control Transmission Protocol”; IETF RFC 2960, Oct. 2000; pp. 1-134.
K. Morneault et al.; “ISDN Q.921-User Adaptation Layer”; version 8; IETF Work in Progress; Nov. 2000; pp. 1-51.
Information Science Institute; “Transmission Control Protocol”; DARPA Internet Program Protocol Specification; IETF RFC 793; Sep. 1981; pp. 1-85.
M.T. Rose and D.E. Cass; “ISO Transport Service on Top of the TCP”; IETF RFC 1006; May 1987; pp. 1-18.
J. Postel; “User Datagram Protocol”; IETF RFC 768; AUg. 1980; pp. 1-3.

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