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One-way trunk

In telecommunication, an 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".

Source: from Federal Standard 1037C and from MIL-STD-188

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