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Egress network service monitor
| Details |
Inventors: Begum, Akhtar Jh; Chanda, Rajat;
Assignee: AT&T Corp. (New York, NY)
Primary Examiner: Hsu; Alpus H.
Assistant Examiner: Qureshi; Afsar M
Attorney, Agent or Firm:
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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DETAILED DESCRIPTION A method of recognizing a call failure related problem occurring at an egress network of a telephone system is described wherein information relating to call failures occurring at the egress network is provided by an out-of-band signaling system.
The method comprises the steps of determining a tolerable call failure rate by sampling a plurality of calls at the egress network and monitoring the information relating to call failures associated with the plurality of calls, calculating a threshold based on the tolerable call failure rate using a standard deviation associated with the determining step, calculating a measured call failure rate at the egress network by sampling a predetermined percentage of calls at the egress network and monitoring the information relating to call failures associated with the predetermined percentage of calls, and comparing the measured call failure rate to the threshold and recognizing when the measured call failure rate exceeds the threshold.
A system for recognizing a call failure related problem occurring at an egress network of a telephone system is also described.
The system includes a terminating switch, an out-of-band signaling system for providing information relating to call failures occurring at the egress network, a loop around trunk coupled to the terminating switch for sampling a predetermined percentage of calls at the egress network and a protocol analyzer coupled to the loop around trunk for monitoring the information relating to call failures associated with the predetermined percentage of calls, calculating a measured call failure rate based on the monitored information relating to call failures, and comparing the measured call failure rate to a threshold and recognizing when the measured call failure rate exceeds the threshold.
In the system, a tolerable call failure rate is calculated by sampling a plurality of calls at the egress network and monitoring the information relating to call failures associated with the plurality of calls
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