At+t Corp.

Akhtar Jh Begum

Rajat Chanda

A method of recognizing a call failure related problem occurring at an egress network of a telephone system wherein information relating to call failures occurring at the egress network is provided by an out-of-band signaling system. The method includes determining a tolerable call failure rate, calculating a threshold based on the tolerable call failure rate using a standard deviation, calculating a measured call failure rate at the egress network, and comparing the measured call failure rate to the threshold and recognizing the measured call failure rate exceeds the threshold. In addition, a system for recognizing a call failure related problem occurring at an egress network is described. The system includes a terminating switch, and out-of-band signaling system, a loop around trunk coupled to the terminating switch and a protocol analyzer coupled to the loop around trunk for monitoring the information relating to call failures, calculating a measured call failure rate, comparing a measured call failure rate to threshold and recognizing when the measured call failure rate exceeds the threshold. In an alternate embodiment of the system, a host computer is coupled to the protocol analyzer wherein the host computer calculates the measured call failure rate, compares the measured call failure rate to a threshold, and recognizes when the measured call failure rate exceeds the threshold.

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Holmdel, NJ, United States of America

Akhtar Jh Begum