Using Dial-in Conferencing for Lync 2010 but not enabled for Enterprise voice? Chances are you’re missing an entry in “Line URI”. This “Line URI” is the only way to define a phone number to a user for them to authenticate to Dial-In Conferencing with. If its left blank the common complaint is that the when the user attempts to change their pin entering username and password, then hits enter its goes back to asking for credentials again. Make sure the number you enter is unique, it will not take duplicates.
