RADVision MCU-323, User Manual

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5-1
The H.323 Proxy
The Cisco H.323 Proxy is a device that acts like a gateway and relays H.323 data between
H.323 zones. A Proxy registers with a Gatekeeper, thereby becoming part of that
Gatekeeper's zone. The Proxy isolates endpoints of different zones by concealing their
addresses. The only addresses that are revealed are those of the Gatekeeper and Proxy.
During call setup, the Gatekeepers of each zone obtain address information from each other.
The Proxies use the address information from the Gatekeepers to route the call between
zones. In this way, endpoints in different zones cannot see each other directly. They only
see each other's Proxy address.
The Proxy and Gatekeeper can be configured to manage endpoint to endpoint security when
the network firewall does not support Dynamic Access Control. In addition, the Proxy can
manage Quality of Service (QoS) for gateways that don't support QoS.
The built–in Gatekeeper in RADVision devices such as the MCU-323 or the L2W–323P
Gateway facilitates the use of the Cisco H.323 Proxy by enabling the Proxy to register with
the Gatekeeper. The Gatekeeper routes H.323 signal traffic to or from another zone through
the Proxy.