Gatekeepers
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Transcript of Gatekeepers
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Gatekeepers
Gabe MoultonThe Ohio State [email protected]
Seventh Annual Digital Video Conference March 31, 2005Atlanta, Georgia
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Gatekeepers Provide:
Admission ControlCall AuthorizationAddress TranslationsBandwidth ManagementZone ManagementCall Signal RoutingManagement Functions
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H.323 Gatekeeper
Necessary for operations, but not mandatory in H.323
Required Functions• Address translation• Call admission/authorization
Some bandwidth management
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Typical Gatekeeper Components
Gatekeeper Core FunctionalityWeb Server ManagementSNMP Services
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H.323 Zone
Definition• A single gatekeeper and all of the end points (clients, MCUs, and gateways) that register with the gatekeeper.
Typically is a community• E.g., University or organization
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Basic Operation
Endpoints register with gatekeeperEndpoint asks gatekeeper for permission to place call to another endpoint
Endpoint signals call with other endpointEndpoints exchange media directlyEndpoints disconnect, notify gatekeeper
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Gatekeeper Functionality
Services: • Gives access to multipoint conferences and
gateways Neighbor Gatekeepers:
• Provides inter-zone communication Network Topology:
• Allow administrator to employ traffic shaping Endpoints:
• Live list of registered users Call Control:
• Live list of active calls
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Registrants
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Client Authorization
Open Gatekeepers• anyone can register
Predefined EndpointsLDAP Authenticated Endpoints
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Services
Multipoint Conferences (most prominent use)Gateways to other servicesDefined by a dial string
• Commons conferences use 3 digits–EG 001189700 accesses a 384K conference
Conferences differentiate by pins• Commons uses 4 digits
–EG 0011897001234 access my 384K conference
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Defined Services
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Gatekeeper Alternatives
Standalone Gatekeeper• (e.g., Radvision ECS)
System Blade• (e.g., Radvision ECS on a blade of a ViaIP)
Embedded in an Endpoint• (e.g., A gatekeeper embedded in a Radvision OnLAN MCU or gateway)
Backup Gatekeeper• (e.g., Radvision Alternate Gatekeeper)
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Gatekeeper Alternatives
Other Gatekeepers:• Polycom PathNavigator• Cisco (Radvision code running on Cisco IOS)• VCON Media Exchange Manager, MXM• GNU Gatekeeper (Based on open H.323)
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Specific Example
Radvision embedded gatekeeper• Runs in a Radvision MCU or gateway.• PC configuration software. Provides parameter
setting, remote monitoring and user definition and control.
• Built-in telnet server. Provides optional monitoring and remote control.
• 100 simultaneous registrants and 30 simultaneous calls.
• Free !
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Questions?
Gabe MoultonTechnology Engineer
The Ohio State University614 292 8443