Alarm walls as well as ceilings. Alarm all windows and doors, as well as cellar bulkheads. Use a monitored or supervised alarm system. This would mean that the alarm is being monitored by an alarm company. Most alarm companies offer a system that will indicate trouble in the phone lines should they become disabled, this may be called a pulse system.
Most alarms send a signal through the phone lines.
Often burglars cut the phone lines at the utility pole disabling the ability of the alarm of sent a signal. Having the monitored system would prevent this. Cellular or radio back up. This type of system does not always send a signal in the event the phone wires are tempered with. Often times these systems sent the signal only when the break in has occurred.