Radius, LDAP and Openvpn

Hello I hav working setup on freeradius 2.1.1, Novell eDir as authentication backend and couple of WiFi APs. PEAP and EAP-TTLS PAP and MSCHAPv2 WiFI access attribute is radiusEnableDialAccess Now i would also like to add openvpn access and use different attribute for that. So far I understand that somewhere sholud go unlang stanza something like If calling station IP is openvpnserverIP and attribute enableOvpnAccess is true then send Access-Accepted? Is this right direction to think? Whitch stanza it should go? Authorize? Andres