As far as CallManager Multi Tenant goes, I am good with how to do everything except the directory part. From what I read, I can use the Cisco SDK (editing the XML) to say which directory each phone can see in the Corporate Directory. I'm trying to save myself a lot of research time here. Is there anyone who has been successful in creating multiple directories (using any method) and setting phones up to use these directories. I'm pretty savvy with scripting in both php/asp and I can even setup my own external directory if needed to pull from. I have full control over the system so there isn't anything I have to stay away from. any help is greatly appreciated. I am running CM 7.