However, in common or colloquial usage, a "hotline" often refers to a call center reachable by dialing a standard telephone number, or sometimes the phone numbers themselves.
This is especially the case with 24-hour, noncommercial numbers, such as police tip hotlines or suicide crisis hotlines, which are staffed around the clock and thereby give the appearance of real hotlines.
Most of these hotlines run through the Panmunjeom Joint Security Area (JSA) and are maintained by the Red Cross.
Since 1971, North Korea deactivated the hotlines seven times, the last time in February 2016.
The decision of establishing this hotline was taken during Obama's visit to India in January 2015.
This is the first hotline connecting an Indian Prime Minister to a head of state.
On his visit to the Soviet Union in 1966, French President Charles de Gaulle announced that a hotline would be established between Paris and Moscow.
The line was upgraded from a telex to a high-speed fax machine in 1989.
An example would be a phone that automatically connects to emergency services on picking up the receiver.
Therefore, dedicated hotline phones do not need a rotary dial or keypad.