System administrators cover the third layer, looking at the characteristics of IT systems, including servers and private branch exchanges or fax machines.
22.
In the case of enterprises with a private branch exchange ( PBX ) switch, the ringdown can be operated by the PBX key.
23.
"' Pbxnsip "'is a software implementation of a telephone private branch exchange ( PBX ) produced by a company of the same name.
24.
During its first several years the company's business model consisted mainly of reselling private branch exchange ( PBX ) switches imported from Hong Kong.
25.
"' 3CX Phone System "'is a software based private branch exchange ( PBX ) based on the SIP ( Session Initiation Protocol ) standard.
26.
Businesses, too, must adjust the computerized switchboards known as private branch exchanges, or PBXs, that route calls from their offices to the telephone network.
27.
A VoIP-to-Telco gateway used to interface a VoIP PBX ( private branch exchange ) to analog lines would contain hybrids to perform the required conversion.
28.
The company priced PBX, or private branch exchange, switchboard systems, three years ago, but decided that the up-front costs, about $ 160, 000, warranted waiting.
29.
Local telephone companies also provided PBX ( " Private Branch Exchange " ) services for local businesses that needed these switchboard and internal telecommunications services.
30.
This arrangement prevented harm to private branch exchange ( PBX ) equipment in the event that a StarLAN cable was plugged into the wrong device.
