The paper describes a strategy to implement an alarm component in a server from a tele-assistance / tele-monitoring system to assist elderly persons. The system consists of units located at the homes of the monitored persons collecting and sending medical and environmental data from sensors and a call centre with a server for recording and monitoring the data. Here, specialised staff will support tele-surveillance and tele-assistance services. The need of alarms (logical combinations of threshold levels for the values read from the sensors), the approach to define and implement these at server side, the way to communicate the alarm scenarios to the local computers by using WebServices, are described. Conclusions are issued.
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