outside extension

outside extension

[′au̇t‚sīd ik′sten·chən]
(communications)
Telephone extension on premises separated from the main station.
References in periodicals archive ?
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.
Also, tape all outside extension cord connections to seal out moisture.
For example, outside extension cords are clearly labeled 'Suitable for Use with Outdoor Appliances.
Unlimited sequential or simultaneous call coverage can be set for group or individual backup, again including to an outside extension if not answered internally.