Good news! Mitel recently reached out to me to tell me that my post back in 2012 is now wrong, and that in the latest release of their Live Business Gateway (LBG), they now support DNS load balancing for both Lync Server 2010 and Lync Server 2013 with Remote Call Control (RCC).
We all know we’re seeing less and less RCC with Lync out there these days, with both customers realising that the disadvantages outweigh the positives of RCC and the PBX vendors pushing their client plugins more, but there is still a significant legacy install base of RCC configurations and this news may relieve some pain for those organisations.
To receive the LBG 3.4 SP2 software and documentation, speak to your Mitel provider.