ZyXEL P-2602R-D1A User Guide - Page 149
SIP ALG
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P-2602H(W)(L)-DxA Series User's Guide Table 50 Port Forwarding Rule Setup (continued) LABEL Apply Cancel DESCRIPTION Click Apply to save your changes back to the ZyXEL Device. Click Cancel to begin configuring this screen afresh. 10.5.2 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. 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 > NAT > ALG. Figure 83 Network > NAT > ALG Each field is described in the following table. Table 51 Network > NAT > ALG LABEL Enable SIP ALG Apply Reset DESCRIPTION Select this to make sure SIP (VoIP) works correctly with port-forwarding and address-mapping rules. Click this to save your changes and to apply them to the ZyXEL Device. Click this to return to previously saved configuration. Chapter 10 Network Address Translation (NAT) Screens 149