Noun
trunk call (plural trunk calls)
(telephony, dated, chiefly Britain) a long-distance telephone call, especially one connected by the operator
Telecommunications main A long-distance call is a "trunk call" in British English, but is a "toll call" in American English. Source: Internet
The 1-200 area has occasionally been used as an unused space in which to place test numbers, but is rare as in most communities a 1- indicates a long-distance trunk call. Source: Internet
The originating marker then passed the trunk call completion requirements (type of pulsing, resistance of the trunk, etc.) and the called party's details to the sender and released. Source: Internet