Gatekeepers
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Gatekeepers. Gabe Moulton The Ohio State University [email protected] 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

Gatekeepers

Gabe Moulton

The Ohio State University

[email protected]

Seventh Annual Digital Video Conference

March 31, 2005

Atlanta, Georgia


Gatekeepers provide

Gatekeepers Provide:

  • Admission Control

  • Call Authorization

  • Address Translations

  • Bandwidth Management

  • Zone Management

  • Call Signal Routing

  • Management Functions


H 323 gatekeeper

H.323 Gatekeeper

  • Necessary for operations, but not mandatory in H.323

  • Required Functions

    • Address translation

    • Call admission/authorization

  • Some bandwidth management


Typical gatekeeper components

Typical Gatekeeper Components

  • Gatekeeper Core Functionality

  • Web Server Management

  • SNMP Services


H 323 zone

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


Basic operation

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


Gatekeeper functionality

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


Registrants

Registrants


Client authorization

Client Authorization

  • Open Gatekeepers

    • anyone can register

  • Predefined Endpoints

  • LDAP Authenticated Endpoints


Services

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


Defined services

Defined Services


Gatekeeper alternatives

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)


Gatekeeper alternatives1

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)


Specific example

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 !


Questions

Questions?

Gabe Moulton

Technology Engineer

The Ohio State University

614 292 8443


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