Hi mlross,
In addition to above suggestions, I will add: when Lync server 2013 is coexisted with Skype for business 2015, DNS record could point to Lync server 2013, or Skype for business server 2015,
because request from Lync server 2013 could be redirected to Skype for business server 2015 as above said.
However, DNS record should be pointed to Skype for business server 2015 when we will decommission Lync server 2013.
Best Regards,
Jim Xu
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