We are currently running Unity 2.4.0.120 and the integration type on the system key is none. Does the system key need to have TAPI as the integration type in order for Unity 2.4.6 to work properly. If the answer is yes, how do we proceed with the upgrade? Do we need to upgrade the key before starting the upgrade, during the upgrade, or at the end of the upgrade? One more question, who do I contact to get the key upgrade?<br><br>