Lync Server 2013 has introduced an Autodiscover Service where the newer versions of Lync 2010 and Lync 2013 clients prefer Autodiscover over DNS SRV records discover. When SfB / Lync 2013 client can successfully sign in, it can be the Lync Autodiscover Service has been properly configured. However, if you do not configure the legacy DNS SRV discovery properly, this would result the Trio cannot sign-in as Trio only support DNS SRV discovery. See Understanding Autodiscover in Lync Server 2013 in Microsoft TechNet for details.
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