ZyXEL P-660HNU-F1 User Guide - Page 179
The ALG Screen
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Figure 87 Network Setting > NAT > Sessions Chapter 11 Network Address Translation (NAT) The following table describes the fields in this screen. Table 49 Network Setting > NAT > Sessions LABEL MAX NAT Sessions DESCRIPTION Use this field to set a common limit to the number of concurrent NAT sessions each client computer can have. Apply Cancel 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. Click Apply to save your changes. Click Cancel to restore your previously saved settings. 11.4 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. 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. Figure 88 Network > NAT > ALG The following table describes the fields in this screen. Table 50 Network > NAT > ALG LABEL DESCRIPTION ALG Select enable to make sure SIP (VoIP) works correctly with port-forwarding and address-mapping rules. Apply Click this to save your changes. ADSL Series User's Guide 179