The secret behind the strange sound, disaster messages on mobile

In order to give warning/information to the citizens of the country about future calamities, emergency situation, trial flash messages with warning beep sound have started coming to everyone's mobile from yesterday.

As part of the central government's new plan to reach out to the citizens of the country, the Department of Telecommunications (C-DOT) is preparing a new system of emergency alert system for all cell phone users through cell broadcasting, and the messages have started coming in from the last couple of days.

What's in the message?
Important Advisory: Department of Telecommunications (DOT), Government of India, is conducting trial testing for the Cell Broadcasting System in collaboration with the National Disaster Management Authority. You may receive test alerts on your mobile device with sound and vibrations. We assure you that these alerts are part of the planned testing process, do not indicate an actual emergency, and do not require any action at your end, please.