Telecommunications call preservation in the presence of control

Details Telecommunications call preservation in the presence of control Telecommunications call preservation in the presence of control

1996-12-24

1999-08-03

Kuntz, Curtis A.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of data transmission

379 9, 379 14, 395181, 39518208, 39518211, 370217, H04M 124, H04M 308, H04M 322

Patent

active

059334746

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. In accordance with this invention, the storing of a file of backup messages is eliminated when the processors have inadequate spare processing capacity because of high traffic. Advantageously, this permits the backup procedure to be carried out under normal circumstances without reducing the processing capacity of the system. 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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