Cannot complete the transfer in Lync Server 2013

Recently I had a standard Lync call forwarding issue at a new SIP trunk deployment. The problem was that I could not forward any calls to my cellphone, use call forwaring or simring. This was a Lync 2013 deployment, but making sure that EnableSipRefer is set to $False still applies in 2013. And usually fixes this issue by using this PowerShell Cmdlet: Set-CsTrunkConfigurationEnableReferSupport $False. After running the cmdlet it usually just works and to be sure I logged the client out and in. So if you have the same issue try this first.

This time though it did not work, even when stopping and starting the Lync services. I had to troubleshoot more. Continue reading