Microsoft® Lync Server 2010 Unleashed

SRV Records

An issue with the architecture of Office Communications Server 2007 and 2007 R2 was that clients used only a single DNS SRV record. If a Director was in use, the SRV record typically pointed to it to ensure users signed in to a Director first and not directly to a front end pool. On one hand, this provided the administrator with control over where users initially authenticated to, but on the flip side this represented a single point of failure. If there was an issue with the Director or pool of Directors, clients would not be able to sign in. This dilemma can be mitigated in a few ways with Lync Server; either by adding more nodes to a pool or by using multiple SRV records with different priorities.

Now, endpoints recognize multiple ...