RADVision MCU-323, User Manual

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Supporting the H.323 Proxy
5-2
Proxy Facilitated Call Flow
The call flow described below is a typical example of how the Proxy is used to process a
call.
ZONE 2
GK 1 GK 2
PROXY 1 PROXY 2
ENDPOINT 1 ENDPOINT 2
ZONE 1
1
2
3
4
5
Figure 5-1 – Obtaining Address Information via GK
The call flow steps below correspond to the numbering in Figure 5-1 and Figure 5-2 :
1. Endpoint 1 in Zone 1 requests permission from Gatekeeper 1 to call Endpoint 2,
located in Zone 2.
2. Gatekeeper 1 identifies Gatekeeper 2 as the Gatekeeper for Endpoint 2, and asks for
the Endpoint 2 address.
3. Gatekeeper 2 in Zone 2 replies to Gatekeeper 1 with the address of Proxy 2, thus
hiding the address of Endpoint 2 from Zone 1.
4. Gatekeeper 1 passes on the Proxy 1 address to Endpoint 1.
5. Endpoint 1 calls Proxy 1.