Gatekeepers
A Gatekeeper is a device used to permit or deny requests for video-conferences;
they are an integral part of the IP-based video conferencing solution. It is responsible
for deciding if enough resources are available for the video conference to
occur, and if the device requesting the conference can gain access to the
requested resources. Currently, there are two solutions in the Cisco product line
that offer Gatekeeper functionality, the IPVC 3510, and the Multimedia
Convergence Manager (MCM) IOS feature set available for the 2500, 2600,
3600, 7200, and MC3810 platforms.