The Alg Screen - ZyXEL Communications CellPipe 7130 RG User Manual

The following table describes the fields in this screen.
Table 45 NAT > DMZ Host
LABEL
Default Server
Apply

8.5 The ALG 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.
Table 46 NAT > ALG
LABEL
Active SIP ALG
Apply
Wait for the CellPipe 7130 RG to fully reboot before accessing it again.
CellPipe 7130 RG User's Guide
DESCRIPTION
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.
Click Apply to save your changes back to the CellPipe 7130 RG.
DESCRIPTION
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.
Click Apply to save your customized settings.
Chapter 8 Network Address Translation (NAT)
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