Emergency communication system
Using that, some of the more modern emergency communication systems such as Siemens Sygnal or MessageNet Connections say that they can send a single message at one time that gives full details to first responders while customizing that same message to give more simple instructions to lock doors to the people inside the building. By using a single message that divides the content between types of users, fewer messages have to be created and sent, which may also save time.