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Video User D
NAT/Firewall
Video User A
Video User F
H.323 requires many connections in order to establish a call, for example,
Q.931 and H.245 TCP connections and multiple RTP UDP streams. H.460.18
allows an H.323 device to traverse a NAT/Firewall by having the private-side
endpoint initiate all TCP connections and UDP streams to the outside H.323
device.
Note: When NAT/Firewall connections are configured, H.323 Fixup software
must be turned off.
In the previous figure, the following communication between video users is
available:
•
User D communicates to Users A, B, C, E, and F.
Gatekeeper
2
V
IU-S
Internet
NAT/Firewall
Configuring for Video
Video User E
Video User C
Trusted
Video User B
4 - 29
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