ZyXEL Communications P-660HNU-Fx Manual De Usuario

 Chapter 11 Network Address Translation (NAT)

ADSL Series User’s Guide

Network Setting > NAT > Sessions

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. 
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. You do not need to 
use STUN or an outbound proxy if your ZyXEL Device is behind a SIP ALG.

Use this screen to enable and disable the SIP (VoIP) ALG in the ZyXEL Device. To access this 
screen, click Network Setting > NAT > ALG.

Network > NAT > ALG

The following table describes the fields in this screen.

Network Setting > NAT > Sessions

MAX NAT Sessions

Use this field to set a common limit to the number of concurrent NAT sessions each 
client computer can have.

If only a few clients use peer to peer applications, you can raise this number to improve 
their performance. With heavy peer to peer application use, lower this number to 
ensure no single client uses too many of the available NAT sessions.

Apply

Click Apply to save your changes.

Cancel

Click Cancel to restore your previously saved settings.

Network > NAT > ALG

ALG

Select enable to make sure SIP (VoIP) works correctly with port-forwarding and 
address-mapping rules.

Apply

Click this to save your changes.