Is it possible to change relay states to manage a generic dialler or activate other devices?

Yes, from the control unit menu Alarm/Setup/Messages Management, it is possible to send a command to zones with relay actuators installed for mechanical switching. The types of messages that can be managed from this menu include: Arming/Disarming of the SAI, triggering of Intrusion Alarms, Tamper Alarms, Low Battery and Mains power outage.