Hotline

hot linetelephone hotlinehot-lineshotline connectionhotline shotlinesin-house telephone
A hotline is a point-to-point communications link in which a call is automatically directed to the preselected destination without any additional action by the user when the end instrument goes off-hook.wikipedia
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Telephone call

callphone callphone calls
A hotline is a point-to-point communications link in which a call is automatically directed to the preselected destination without any additional action by the user when the end instrument goes off-hook.
This is called a hot line or ringdown.

Moscow–Washington hotline

hotlineHot Linered telephone
The most famous hotline between states is the Moscow–Washington hotline, which is also known as the "red telephone", although telephones have never been used in this capacity.
Although in popular culture it is known as the "red telephone", the hotline was never a telephone line, and no red phones were used.

Ringdown

Private line automatic ringdownmagneto crank telephonessecure line
A hotline can also be called an automatic signaling, ringdown, or off-hook service.
(Some Cisco VoIP phones and analog adapters treat a dial plan of (S0 ) as a hotline configuration which dials 1-234-567890 zero seconds after the telephone is taken off-hook, for instance).

Seoul–Pyongyang hotline

direct phone linedirect phone lineshotline between North and South Korea
Between North and South Korea there are over 40 direct phone lines, the first of which was opened in September 1971.
The Seoul–Pyongyang hotline is actually not a single hotline as there are over 40 telephone lines that connect North and South Korea.

Crisis hotline

suicide hotlinehotlinetelephone helpline
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.
Hotline

Senkaku Islands dispute

Senkaku IslandsdisputedDiaoyu/Senkaku Islands
In February 2013, the Senkaku Islands dispute gave renewed impetus to a China–Japan hotline, which had been agreed to but due to rising tensions had not been established.
In 2009 a hotline was agreed to (and in 2010 a military-to-military hotline), neither of which have been implemented.

Point-to-point (telecommunications)

point-to-pointpoint to pointpoint-to-point connections
A hotline is a point-to-point communications link in which a call is automatically directed to the preselected destination without any additional action by the user when the end instrument goes off-hook.

Information transfer

communicationstransferconvey
A hotline is a point-to-point communications link in which a call is automatically directed to the preselected destination without any additional action by the user when the end instrument goes off-hook.

Data link

datalinklinkdata-link
A hotline is a point-to-point communications link in which a call is automatically directed to the preselected destination without any additional action by the user when the end instrument goes off-hook.

User (telecommunications)

userUsersinternet users
A hotline is a point-to-point communications link in which a call is automatically directed to the preselected destination without any additional action by the user when the end instrument goes off-hook.

End instrument

A hotline is a point-to-point communications link in which a call is automatically directed to the preselected destination without any additional action by the user when the end instrument goes off-hook.

On- and Off-hook

off-hookon-hookon hook
A hotline is a point-to-point communications link in which a call is automatically directed to the preselected destination without any additional action by the user when the end instrument goes off-hook.

Signaling (telecommunications)

signalsignalingsignalling
A hotline can also be called an automatic signaling, ringdown, or off-hook service.

Call centre

call centercall centerscall centres
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.

Cuban Missile Crisis

missile crisisCuban Quarantine1962 Cuban Missile Crisis
This direct communications link was established on 20 June 1963, in the wake of the Cuban Missile Crisis, and utilized teletypewriter technology, later replaced by telecopier and then by electronic mail.

World War II

Second World WarwarWWII
Already during World War II—two decades before the Washington–Moscow hotline was established—there was a hotline between No. 10 Downing Street and the Cabinet War Room bunker under the Treasury, Whitehall; with the White House in Washington, D.C. From 1943 to 1946, this link was made secure by using the very first voice encryption machine, called SIGSALY.

10 Downing Street

Prime Minister's OfficeDowning StreetNumber 10
Already during World War II—two decades before the Washington–Moscow hotline was established—there was a hotline between No. 10 Downing Street and the Cabinet War Room bunker under the Treasury, Whitehall; with the White House in Washington, D.C. From 1943 to 1946, this link was made secure by using the very first voice encryption machine, called SIGSALY.

Churchill War Rooms

Cabinet War RoomCabinet War RoomsWar Rooms
Already during World War II—two decades before the Washington–Moscow hotline was established—there was a hotline between No. 10 Downing Street and the Cabinet War Room bunker under the Treasury, Whitehall; with the White House in Washington, D.C. From 1943 to 1946, this link was made secure by using the very first voice encryption machine, called SIGSALY.

White House

The White HousePresident's HouseExecutive Mansion
Already during World War II—two decades before the Washington–Moscow hotline was established—there was a hotline between No. 10 Downing Street and the Cabinet War Room bunker under the Treasury, Whitehall; with the White House in Washington, D.C. From 1943 to 1946, this link was made secure by using the very first voice encryption machine, called SIGSALY.

SIGSALY

Green Horneta special scramblercomputers of the era
Already during World War II—two decades before the Washington–Moscow hotline was established—there was a hotline between No. 10 Downing Street and the Cabinet War Room bunker under the Treasury, Whitehall; with the White House in Washington, D.C. From 1943 to 1946, this link was made secure by using the very first voice encryption machine, called SIGSALY.

Moscow

Moscow, RussiaMoskvaMuscovite
A hotline connection between Moscow and Beijing was used during the 1969 frontier confrontation between the two countries.

Beijing

PekingBeijing, ChinaBeiping
A hotline connection between Moscow and Beijing was used during the 1969 frontier confrontation between the two countries.

Charles de Gaulle

de GaulleGeneral de GaulleGénéral de Gaulle
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.

William Hague

Lord Hague of RichmondWilliam Hague, Baron Hague of RichmondHague
An upgrade was announced when Foreign Secretary William Hague visited Moscow in 2011.