Patent ID: 8054753

Claim:
A method for determining an influenced range of a fault occurrence in a network including a group of proxy servers for processing a signaling protocol for transferring signaling messages through a communication route connecting a pair of user terminals, comprising: providing proxy connection information indicative of connection relations between each pair of proxy servers included in the group of proxy servers in association with a direction of a traffic flow there between; establishing a communication session between a pair of user terminals by setting a communication route that connects the pair of user terminals and passes through one or more proxy servers included in the group of proxy servers; capturing a signaling message that is received or transmitted by each of the one or more proxy servers; detecting an abnormal end of the communication session between the pair of user terminals by analyzing the captured signaling message; determining a cause section that is a section included in the communication route connecting the pair of user terminals and has caused the detected abnormal end of the communication session; creating an abnormal session record including information on the abnormally ended communication session and information on the determined cause section; accumulating the abnormal session record created in association with the abnormally ended communication session to provide an abnormal session record set; counting the number of abnormally ended communication sessions caused by the cause section on the basis of the abnormal session record set; and determining the influenced range of the fault occurrence in the network, on the basis of the counted number of abnormally ended communication sessions caused by each of cause sections and the proxy connection information indicative of connection relations among the group of proxy servers, so as to display the influenced range of the fault occurrence in the network.