In telecommunication, a one-way trunk is a trunk between two switching centers, over which traffic may be originated from one preassigned location only.
Note 1: The traffic may consist of two-way communications; the expression "one way" refers only to the origin of the demand for a connection.
Note 2: At the originating end, the one-way trunk is known as an "outgoing trunk" ; at the other end, it is known as an "incoming trunk".
This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C" (in support of MIL-STD-188).
See also: Telephone signaling interface