ZyXEL P-660H-T1 v3s User Guide - Page 115
The SIP ALG Screen
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Chapter 8 Network Address Translation (NAT) Table 26 Network > NAT > Address Mapping: Edit (continued) LABEL DESCRIPTION Server Mapping Set Only available when Type is set to Server. Select a number from the drop-down menu to choose a port forwarding set. Edit Details Click this link to go to the Port Forwarding screen to edit a port forwarding set that you have selected in the Server Mapping Set field. Back Click this to return to the previous screen without saving. Apply Click this to save your changes. Cancel Click this to restore your previously saved settings. 8.5 The SIP 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 P-660H-T1v3s registers with the SIP register server, the SIP ALG translates the P-660H-T1v3s'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 P-660H-T1v3s is behind a SIP ALG. Use this screen to enable and disable the SIP (VoIP) ALG in the P-660H-T1v3s. To access this screen, click Network > NAT > ALG. Figure 42 Network > NAT > ALG The following table describes the fields in this screen. Table 27 Network > NAT > ALG LABEL DESCRIPTION Enable SIP ALG Select this to make sure SIP (VoIP) works correctly with portforwarding and address-mapping rules. Apply Click this to save your changes. Reset Click this to restore your previously saved settings. P-660H-T1v3s User's Guide 115