ZyXEL Communications P-2602R-DxA Series - Manual (Page 117)

P-2602R/RL-DxA Series User’s Guide
Chapter 9 Network Address Translation (NAT) Screens 117
The following table describes the fields in this screen.
9.5.2 SIP ALG
Some NAT routers may include a SIP Application Layer Gateway (ALG). A SIP ALG allows
SIP calls to pass through NAT by examining and translating IP addresses embedded in the
data stream. When the ZyXEL Device registers with the SIP register server, the SIP ALG
translates the ZyXEL Device’s private IP address inside the SIP data stream to a public IP
address.
Use this screen to enable and disable the SIP (VoIP) ALG in the ZyXEL Device. To access
this screen, click Network > NAT > ALG.
Table 34 Port Forwarding Rule Setup
LABEL DESCRIPTION
Active Click this check box to enable the rule.
Service Name Enter a name to identify this port-forwarding rule.
Start Port Enter a port number in this field.
To forward only one port, enter the port number again in the End Port field.
To forward a series of ports, enter the start port number here and the end port
number in the End Port field.
End Port Enter a port number in this field.
To forward only one port, enter the port number again in the Start Port field above
and then enter it again in this field.
To forward a series of ports, enter the last port number in a series that begins with
the port number in the Start Port field above.
Server IP
Address
Enter the inside IP address of the server here.
Back Click Back to return to the previous screen.
Apply Click Apply to save your changes back to the ZyXEL Device.
Cancel Click Cancel to begin configuring this screen afresh.