Emergency communications network

An emergency communications network is designed to provide reliable communications during an emergency.
The term may refer to a military network, such as:
Emergency communication networks may also be used for notifying the public of emergencies requiring action.
It also may refer to a network established by civil authorities, with or without volunteer help:
Frequently, a previously established Emergency communications center provides dispatching of Emergency services and Emergency operations center capabilities during a severe disaster. In the United States, dialing 911 is the most frequent method of contacting the dispatch personnel.