Are you currently using the default CallManager LDAP directory? If so, that's okay, you can integrate CallManager into AD after your servers upgrade. It will work just fine. FYI - CallManager also support iPlanet directory.
There is a very good articale on this months new security CSO magazine that will guide you to make the best decision. Check the article "Why Outsourcing won't work" http://www.csoonline.com/read/030103/undercover.htmlIt is good to evaluate the cost b...