PBX

1. a manually or automatically operated telephone facility that handles communications within an office, office building, or organization and that is connected to the public telephone network.

PBX

abbreviation for

1. private branch exchange; a telephone system that handles the internal and external calls of a building, firm, etc

Word History and Origins

Origin of PBX¹

P(rivate) B(ranch) Ex(change)

Example Sentences

It is a PBX machine and is in the nature of a board up on the wall and it has several sections.

From Project Gutenberg