In the absence of a local operator, this module forwards alarms to remote operators. The operator acknowledges the call cycle, then operates remotely (viewing and command) or goes to the plant. The calendar handles the schedules, replacements, derogations, and the processes attached to the various natures of the faults. Unlike add-ons, full integration of the on-call function into TOPKAPI provides very easy configuration and maintenance, without repeating the information entered or changed. All the information for following up the transmission of messages is accessible within TOPKAPI.