ZyXEL P-660H-T1 v3s User Guide - Page 115

The SIP ALG Screen

Page 115 highlights

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

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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
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.
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.