
Different video conferencing scenarios
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Figure 15: MCU or IP VCR with a gatekeeper and two or more endpoints
ISDN GW with a gatekeeper and IP and ISDN endpoints
You can configure the ISDN gateway to use a gatekeeper, which can make it easier for end-users to make
calls using directory numbers rather than requiring them to know the IP address or host name of the ISDN
gateway.
Figure 16: ISDN gateway with a gatekeeper, IP endpoints and an ISDN endpoint
Video conferencing with a gateway
A gateway can be useful when you do not have a gatekeeper or the gatekeeper is not accessible, for example
because it is behind a company firewall. The gateway can be a protocol converter such as Codian’s ISDN
gateway discussed previously, but it can also be a interface between two networks using the same protocol.
IP
IP
IP
endpoint
IP
endpoint
IP
IP network
MCU or IP VCR
H.323
Gatekeeper
IP
endpoint
IP
ISDN
IP
IP network
ISDN
ISDN Gateway
ISDN
endpoint
IP
endpoint
ISDN
H.323
Gatekeeper
MCU
IP
endpoint
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