I assume that by integration you want AD to authenticate Users ?
There are two ways to do it
1. Configure IAS RADIUS on the domain Controller (IAS is Microsoft RADIUS Service) and then configure the router to use RADIUS to contact the IAS Service. IAS service can be configured to use AD database for User Authentication.
Router config will be similar to below
aaa authentication ppp ias group radius aaa authorization network default group radius if-authenticated vpdn-group pptp ! Default PPTP VPDN group accept-dialin protocol pptp virtual-template 2 interface Virtual-Template2
peer default ip address pool ppp-pool ppp encrypt mppe auto ppp authentication ms-chap-v2 ias radius-server host .... (Configure the IAS RADIUS Server Address)
2. If you don't want to use RADIUS then you can configure the Router to talk to AD Server using LDAP.
More info on this can be found below
i'm interested in configuring PPTP VPN with this second way you gave but i'm unable to access these materials to which you gave the link.
Could you write what should I do?
Can you access the below link ?
You might need to login using your CCO credentials to access the documents.