TP-Link TD-W9980 User Guide - Page 50
DSL Settings, 4.5.8 IPSec VPN, TD-W9980, H323 ALG, Enable, SIP ALG, Advanced Setup, DSL Settings
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TD-W9980 N600 Wireless Dual Band Gigabit VDSL2 Modem Router User Guide H323 ALG: To allow H323 clients and servers to transfer data across NAT, click Enable. SIP ALG: To allow SIP clients and servers to transfer data across NAT, click Enable. Click the Save button to save your settings. 4.5.7 DSL Settings Choose "Advanced Setup""DSL Settings", you can select the DSL Modulation Type and Annex Type in the next screen. The DSL feature can be selected when you meet the physical connection problem. Please check the proper settings with your Internet service provider. Figure 4-26 DSL Modulation Type: Select the DSL operation Modulation Type which your DSL connection uses. Annex Type: Select the DSL operation Annex Type which your DSL connection uses. Click the Save button to save your settings. 4.5.8 IPSec VPN Choose "Network""IPSec VPN", you can Add/Remove or Enable/Disable the IPSec tunnel connections on the screen as shown in Figure 4-27. Figure 4-27 This section will guide you to configure a VPN tunnel between two TD-W9980s. The topology is as follows. 40