Importance

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Abstract

This invention relates to methods and apparatus for continuing the processing of a telecommunications call in the presence of a failure of a call processor. A backup processor is designated for each call, and a file of signaling messages for that call is maintained in that backup processor. When a failure of the call processor is detected, the file of accumulated messages for the call is processed by the backup processor in order to build up a call state for the call, but without sending call control messages for the call. Subsequent signaling messages are processed by the backup processor, including transmitting call control messages to other processors for establishing the call. Advantageously, the backup processor only processes signaling messages when a failure is detected thus greatly reducing the processing resources required for a typical call (which, of course, does not involve a processor failure).

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First Claim