Draytek 2800 Series - Manual (Page 168)

Vigor2800 Series User’s Guide 164
If a PPP-based service is selected, you should further specify the remote peer IP
Address, Username, Password, PPP Authentication and VJ Compression for this
Dial-Out connection.
6. Set Dial-In settings to as shown below to allow Router A dial-in to build VPN
connection.
If an IPSec-based service is selected, you may further specify the remote peer IP
Address, IKE Authentication Method and IPSec Security Method for this Dial-In
connection. Otherwise, it will apply the settings defined in IPSec General Setup above.