(1) (Gatekeeper) An application validation check in iOS and Mac OS X (as of Version 10.8). See
Mountain Lion.
(2) In an H.323 IP telephony or video environment, a gatekeeper is a device that manages domains and provides call control. It is used to translate user names into IP addresses, to authenticate users and to manage network resources. Gatekeepers also provide call authorization and accounting information. See
H.323 and
MCU.
(3) An organization that exercises a great amount of control over how its products are sold and used. See
walled garden and
European regulations.