~20 years or so ago, the warning sirens in the small town I grew up in could be easily turned on/off by simply dialing a phone number and issuing the correct DT

~20 years or so ago, the warning sirens in the small town I grew up in could be easily turned on/off by simply dialing a phone number and issuing the correct DTMF tones. I'd like to think they have a more secure mechanism nowadays but I would be quite surprised if they actually did.