The gatekeeper provides address translation between alias and transport addresses upon an endpoint s request for service. Other mechanisms can be implemented to support endpoints that do not use the RAS channel for routing communications messages. As a result of limited share resources, not all users will be able to access the network at the same time.
Gatekeepers also protect the integrity of the network for all users according to specified policies.
The gatekeeper may also accept all requests for bandwidth changes where no policies are enforced. The gatekeeper uses a routed call-signaling model to route call signaling and control channels to the appropriate entities in the network. Gatekeeper Environment 2. Mandatory Features 3. Optional Features 4.