Communication system and method

Details Communication system and method Communication system and method

2006-08-01

2006-08-01

Le, Dieu-Minh (Department: 2114)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S011000

Reexamination Certificate

active

07085960

ABSTRACT:
The present invention relates to a communication system and method and, more particularly, to a fault tolerant network element for providing fault tolerant call connections in the event of a failure of, for example, a Gatekeeper or other part of a network. Calls set up across a network consume large amounts of resources both throughout the network and at the devices which form the end points of the network. Therefore, even though a call connection may be supported, in the event of the failure of a network element, it is often the case that there is an ungraceful failure or use of resources throughout the network. Accordingly, an aspect of the present invention provides a method for preserving a connection context at a first layer of a communication protocol; the communication protocol comprising a second, higher, signalling layer in which, in response to a switch-over from an active host to a standby host in the event of failure of the former, the connection is terminated in response to receipt of a signalling layer signal other than a disconnect or terminate signal.

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