Call the house first. If no answer, call appropriate department (fire , med, LEO), then call my cell.
We had an incident at another house where someone broke and opened a window. By the time the company called the house with no answer, called my cell to tell me

I figured if no one is at home, no need to wait as we cant look into it anyway.
The only false alarms we've had were related to batteries going bad in a remote sensor in the workshop. It sounded the alarm, got the neoghbors fired up, but the alarm company's code showed bad sensor and not an event.