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Supporting the H.323 Proxy
Proxy Facilitated Call Flow
The call flow described below is a typical example of how the Proxy is used to process a
call.
GK 1
1
4
5
ENDPOINT 1
ZONE 1
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.
5-2
2
3
PROXY 1
GK 2
PROXY 2
ENDPOINT 2
ZONE 2
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