Mikrotik L2TP client and ISA L2TP server with preshred key

Hi all,

I have ISA 2006 server that I configured as L2TP server with preshared key. On another side I have mikrotik routerboard 750, and I want to use it as L2TP client to connect to ISA server. So my question is, how to configure mikrotik as L2TP client with preshared key? I can’t find any guide regarding this in the internet.

Thanks