One or more non-transitory computer-readable storage mediums storing one or more programs for a testing procedure which tests a data communication apparatus which sends status information of at least one managed apparatus which is to be remotely managed by the central managing apparatus to the central managing apparatus via a communication line, said one or more programs, comprising:
- a parameter sending procedure causing the central managing apparatus to send a plurality of sets of parameters, which are related to an access from the data communication apparatus to the central managing apparatus, to the data communication apparatus, said parameters including a called telephone number which is called when the central managing apparatus is called from the data communication apparatus and/or line type information indicating a type of line to which the data communication apparatus is connected;
- an identification information adding procedure causing the central managing apparatus to add identification information to each of the plurality of sets of parameters which are to be sent by said parameter sending procedure, the identification information identifying the sets of parameters that successfully connect to the central managing apparatus from the data communication apparatus and enabling discrimination of a log of parameter changes made over time;
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- a test communication request procedure causing the central managing apparatus to send a test communication request to the data communication apparatus;
- a storage procedure causing the central managing apparatus to store in a storage unit, when a test communication is received from the data communication apparatus, a set of parameters used in the test communication and the identification information corresponding to the set of parameters used in the test communication as a log of parameter changes made over time;
- a resetting procedure causing the central managing apparatus to reset, when the test communication is received from the data communication apparatus, the parameters at the data communication apparatus related to the identification information stored in the storage unit based on the identification information received in the test communication;
- a parameter set procedure causing the data communication apparatus to be set with the plurality of sets of parameters which are added with the identification information and are sent from the central managing apparatus;
- a test communication procedure causing the data communication apparatus to call the called telephone number and making a test communication in response to the test communication request from the central managing apparatus, the test communication being based on the plurality of sets of parameters set by the parameter set section and including the identification information;
- a judging procedure causing the data communication apparatus to judge which sets of parameters successfully connect to the central managing apparatus by checking the storage unit;
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- a setting procedure causing the data communication apparatus to set each set of parameters that successfully connects to the central managing apparatus.