CallManager 7 "Services Provisioning" in Enterprise Parameters "

This parameter is new in Cisco CallManager 7.  After upgrade from 5.1 or 6.1, some of my CallManager sites that had "Service Button" changed and that bringing up Directory no longer works.  Until today I finally accidentally saw this "Services Provisioning" parameter has default value set to "Internal" and other choices are "Both" and "External".  After change it to "Both", Viola, it works again.