Noun
private branch exchange (plural private branch exchanges) (abbreviated as PBX)
(telecommunications) A telecommunications switching system, physically located at a customer's place of business, that provides internal communication between users and also access to outside (trunk) telephone lines.
DECT is used primarily in home and small office systems, but is also available in many private branch exchange (PBX) systems for medium and large businesses. Source: Internet
In the case of enterprises with a private branch exchange (PBX) switch, the ringdown can be operated by the PBX key. Source: Internet
The MDF in a private branch exchange performs functions similar to those performed by the MDF in a central office. Source: Internet
Some businesses use a telephone network on a greater scale through a private branch exchange. Source: Internet
The service provides routing of telephone calls from a client's private branch exchange (PBX) telephone system to the public switched telephone network (PSTN). Source: Internet