PLANET VIP-254NT - Manual (Page 29)

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VPN (PPTP & L2TP) Settings
The IP Phone has support PPTP and L2TP VPN client connections, the use could choose the VPN type,
and input the authorization accounts for VPN connection in this page.
SNTP Settings
This page defines the primary and second SNTP Server IP Address, to get the date/time information.
Also you can base on your location to set the Time Zone, and how long need to synchronize again.
When you finished the setting, please click the Submit button.