SOYO AVRO3001 - Manual (Page 16)

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Figure 5-10
5.4.2 Virtual Server
The AVRO 3001 VoIP router has NAT router functionality. All the IP
addresses coming in and going out to the AVRO 3001 VoIP router are
converted between public and private IP addresses. You can configure the
AVRO 3001 VoIP router as a virtual server so that remote users accessing
services such as the Web or FTP at your local sites via public IP address can
be automatically redirected to local servers configured with private IP
address. In other words, depending on the requested service (TCP/UDP),
the AVRO 3001 VoIP router redirects the external service request to the
appropriate server. After entering parameters for an application, you must
press the Add button to confirm this setting. An alternative approach is to
use the Clear button to clear all fields and enter another parameter.
Figure 5-11