Patent Number: 6,169,724

Title: Egress network service monitor

Abstract: 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.

Inventors: Begum; Akhtar Jh (Holmdel, NJ), Chanda; Rajat (Howell, NJ)

Assignee: AT&T Corp.

International Classification: G06F 11/34 (20060101); H04Q 3/00 (20060101); H04M 3/28 (20060101); H04M 3/32 (20060101); G06F 011/00 (); G05B 023/02 (); H04M 007/00 ()

Expiration Date: 01/02/2018