I was recently setting up Exchange UM with SfB and came across this error when trying to call the subscriber access number. I found this in the event log of the Skype for Business Front End Server. Dialplan [DialPlan.domain.com] is not recognized by routing application Cause: Dial plan does not exist, or Skype for … Continue reading Exchange UM – Dial plan does not exist, or Skype for Business Server 2015 does not have permission to read the relevant Active Directory objects. Resolution: