A VoIP gatekeeper is used as a management tool and provides call control and other services for H.323 IP telephony devices. It looks like VoIP gateway.
According to ITU-T standard the four H.323 components are:
Here is what a VoIP gatekeeper looks like...
Gatekeeper by Quintum which was acquired by NET (Network Equipment Technologies) in 2007. Again NET was acquired Sonus in 2012. See announcements below related external resources.
And the following diagram shows when Tenor is deployed on multi-office network:
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External related link/s and resource/s:
NET acquired Quintum Technologies by TMCnet.com
H.323 Gatekeeper by Wikipedia