Many professional security systems include a police response feature. Your security system won’t directly contact the police  any time a sensor triggers. The process is a bit more complex than that.

First, the triggered sensor will alert your alarm control panel. Usually, the control panel will wait between thirty and sixty  seconds before sending a notification to the alarm company, giving you time to disarm the system if you accidentally tripped it.

When the monitoring center receives an alert, an operator will respond based on the company’s protocol. Some companies will  first contact the residence to confirm there’s an emergency and check if any other sensors were triggered. If the monitoring  representative can’t connect with the home, they will then notify the police department.

Other companies don’t wait to contact the authorities—representatives will simultaneously alert the residence and the police. From there, a police officer will check on the property. Depending on the department’s protocols, alarm circumstances, and call volume, the dispatched unit may drive by or investigate your home and property to address the reason for the alarm. – Source: Link