PBX

American  

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 British  

abbreviation

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

---

Etymology

Origin of PBX

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

Example Sentences

See Examples For:

PBX

Yep, old-fashioned PBX boards picking up long-distance calls, coin-box calls, person-to-person.

From The Wall Street Journal ● May 7, 2026

It was there that he began his music career, releasing his debut album PBX 1 in October 2018 under the stage name of Sidhu Moose Wala - or "Sidhu of Moosa", his village.

From BBC ● Jul. 5, 2022

PBX 9502 is especially tricky because it’s an insensitive explosive, meaning it won’t go up if smacked or set on fire.

From Science Magazine ● Jun. 24, 2020

Secursmart has solutions for mobile to mobile as well as PBX interfaces.

From Forbes ● Jul. 30, 2014

Perhaps the worst by-product of this "PBX fraud" is that victim companies and telcos have sued one another over the financial responsibility for the stolen calls, thus enriching not only shabby phreaks but well-paid lawyers.

From The Hacker Crackdown, law and disorder on the electronic frontier by Bruce Sterling