[itsm] issue in integrating otrs to lemonldap-ng

Hello Sir/madam, I have installed and configured Lemonldap-ng(http://lemonldap-ng.org/start) in Centos-6.2 and it supports single sign on for web applications. I have also installed OTRS-3.1.8 in the same system.Now i want to integrate the OTRS into lemonldap-ng, so that i can make use of single sign on feature. please give me the documentation or steps to do so..