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Gatekeepers

Gatekeepers. Gabe Moulton The Ohio State University Moulton.13@osu.edu Seventh Annual Digital Video Conference March 31, 2005 Atlanta, Georgia. Gatekeepers Provide:. Admission Control Call Authorization Address Translations Bandwidth Management Zone Management Call Signal Routing

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Gatekeepers

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  1. Gatekeepers Gabe Moulton The Ohio State University Moulton.13@osu.edu Seventh Annual Digital Video Conference March 31, 2005 Atlanta, Georgia

  2. Gatekeepers Provide: • Admission Control • Call Authorization • Address Translations • Bandwidth Management • Zone Management • Call Signal Routing • Management Functions

  3. H.323 Gatekeeper • Necessary for operations, but not mandatory in H.323 • Required Functions • Address translation • Call admission/authorization • Some bandwidth management

  4. Typical Gatekeeper Components • Gatekeeper Core Functionality • Web Server Management • SNMP Services

  5. 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

  6. Basic Operation • Endpoints register with gatekeeper • Endpoint asks gatekeeper for permission to place call to another endpoint • Endpoint signals call with other endpoint • Endpoints exchange media directly • Endpoints disconnect, notify gatekeeper

  7. 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

  8. Registrants

  9. Client Authorization • Open Gatekeepers • anyone can register • Predefined Endpoints • LDAP Authenticated Endpoints

  10. Services • Multipoint Conferences (most prominent use) • Gateways to other services • Defined 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

  11. Defined Services

  12. 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)

  13. 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)

  14. 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 !

  15. Questions? Gabe Moulton Technology Engineer The Ohio State University 614 292 8443

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