What is causing this?Īnswer: The most recent version of Skype for Business (SFB) for Mac (version 14.05) is known to cause the behavior you described. My Skype for Business (SFB) for Mac is randomly dropping incoming and outgoing calls, and sometimes incoming calls go straight to voice mail without ringing. Phone, Data Network, Video, Work Orders.Computing, Accounts, Office 365, Support Issues.Websites, Web Services, Web Technologies.Classrooms, Computer Labs, Printing, Computing.Blackboard, Academic Learning and Staff Training Systems.