ZyXEL Communications Corporation 5VZ-A2011 Manual De Usuario

 Chapter 8 Network Address Translation (NAT)

CellPipe 7130 RG User’s Guide

The following table describes the fields in this screen. 

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. The SIP ALG translates the CellPipe 7130 RG’s 
private IP address inside the SIP data stream to a public IP address. You do not 
need to use STUN or an outbound proxy if you enable the SIP ALG.

Use this screen to enable or disable the SIP ALG in the CellPipe 7130 RG. To 
access this screen, click NAT > ALG.

Figure 61   NAT > ALG

Each field is described in the following table.

Wait for the CellPipe 7130 RG to fully reboot before accessing it again.

Table 45   NAT > DMZ Host

Default Server

Enter the IP address of the default server which receives packets from 
ports that are not specified in the NAT Port Forwarding screen. 

Note: If you do not assign a Default Server, the CellPipe 7130 RG 

discards all packets received for ports that are not specified 
in the NAT Port Forwarding screen.

Apply

Click Apply to save your changes back to the CellPipe 7130 RG.

Table 46   NAT > ALG

Active SIP ALG

Select this check box to allow SIP sessions to pass through the CellPipe 
7130 RG. SIP is a signaling protocol used in sending of voice signals 
over Internet Protocol.

Apply

Click Apply to save your customized settings.