outside extension

outside extension

[′au̇t‚sīd ik′sten·chən]
(communications)
Telephone extension on premises separated from the main station.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
They may work in 'The Nest', the upcycled secret garden space or the 'Serenity Garden', an outside extension of the Secondary Library.
A Texas man has launched a petition to make it easier to dial 911 in motels, which require dialing an outside extension before the actual number, after his daughter could not be saved following a brutal attack on her in an East Texas motel.
For example, outside extension cords are clearly labeled 'Suitable for Use with Outdoor Appliances.' Using an indoor extension cord outdoors could result in an electric shock or fire hazard."