RADIUS server authentication for Remote User Access (L2TP with IPSec)

Does Peplink Balance 380 supports RADIUS server authentication for Remote User Access by using L2TP+ IPSec protocols?
My RADIUS is a Microsoft NAP server (Windows Server 2012). I have made settings at RADIUS server and set Auth Server + Auth Server Secret on Peplink Balance device according to server’s settings … But there are 2 things that I left blank : Accounting Server + Accounting Server Secret … or what should I fill instead?
I found a KB article for setting RADIUS for PPTP connections, but there is no any info for setting Peplink side.
Please, advise.

Yes.

You may enter the accounting server IP and port number if you have enabled Accounting on Microsoft Raduis server. Else just leave blank.