Device failure influence range grasping apparatus, device failure influence range grasping method, and program

An apparatus failure influence range recognition method executed by a computer, the method comprising:

• receiving apparatus failure information which is failure information of an element constituting a network, user information which is information regarding a user of a service, and call details information of an Internet protocol (IP) telephone;
• and
• calculating, by linking the apparatus failure information, the user information, and the call details information with each other, a subtracted call charge with respect to a call charge for a suspected call influenced by an apparatus failure, wherein calculating the subtracted call charge comprises:
• in a case where a service-influencing failure, which is a failure influencing a voice quality of an IP telephone service, occurs, extracting the call details information of a call charge subtraction target based on the apparatus failure information and the user information, computing the call charge based on the extracted call details information, and calculating the subtracted call charge for each billing identity (ID).

A non-transitory computer readable medium storing one or more instructions causing a computer to execute:

• receiving apparatus failure information which is failure information of an element constituting a network, user information which is information regarding a user of a service, and call details information of an Internet protocol (IP) telephone;
• and
• calculating, by linking the apparatus failure information, the user information, and the call details information with each other, a subtracted call charge with respect to a call charge for a suspected call influenced by an apparatus failure, wherein calculating the subtracted call charge comprises:
• in a case where a service-influencing failure, which is a failure influencing a voice quality of an IP telephone service, occurs, extracting the call details information of a call charge subtraction target based on the apparatus failure information and the user information, computing the call charge based on the extracted call details information, and calculating the subtracted call charge for each billing identity (ID).