I currently have an OCS 2007 Standard Edition deployment using MIIS(modifications made to existing Exchnage 2003 GAL sync) in a Central Forest Topology. In the central forest where the OCS server is located automatic configuration is working correctly. In the trusted User Forest users can log in to the server, however the Sign in address does not get automatically populated in the client software. Once entered the address is kept and auto login works, however i am trying to avoid the initial step of adding the address.
I am sure the software pulls the sip address from Active Directory, but i am not sure if i am missing something in my deployment. Any help would be much appreciated.