Skype for Business/Lync: A federated call failed to establish due to a media connectivity failure where both endpoints are internal

One of my clients had a problem with their Skype for Business Edge server. The federation was configured, but every time they tried to start Skype call with federated company, they were not able to connect. The error that I found in the Monitoring server was: “A federated call failed to establish due to a…

Lync – Add user error: Filter failed to return unique result

Many of us saw the following error when we add user on Lync Server using Lync Control Panel or Powershell: Filter failed to return unique result, “[SipAddress : sip:email@domain.com] [LineURI : tel:+15555555555] [PrivateLine : tel:+15555555555] “ I created the following commands and they always help me to find the conflicting number.  Just replace the number 15555555555 with…