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Chapter 8 Network Address Translation (NAT)

P-660H-T1v3s User’s Guide

115

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

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.

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.

Table 26 Network > NAT > Address Mapping: Edit (continued)

LABEL DESCRIPTION

Table 27 Network > NAT > ALG

LABEL DESCRIPTION

Enable SIP ALG Select this to make sure SIP (VoIP) works correctly with port-

forwarding and address-mapping rules.

Apply Click this to save your changes.

Reset Click this to restore your previously saved settings.

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