[Serusers] LDAP authentication (without Radius)

I'm working in a VoIP solution here in my university and we have a wide LDAP base and I am thinking about using it for I found on the internet Ldap/Ldaps modules for SER (http://www.ethworld.ethz.ch/technologies/sipeth/ser_modules/ldaps), but I am afraid that I could only use them for lookups and not direct authentication. I guess I could use radius for authentication but I dont know if installing a radius server "just" for this would be worth the effort. Does anyone know if there is a way to authenticate users in a LDAP server without using Radius? I mean, could I use SER directly with LDAP without using RADIUS? Regards, Felipe -- Master Student - Electrical Engineering Department Computer Engineering and Telecommunications Research Group Universidade Federal de Minas Gerais - Brazil "For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life." John 3:16