Lync DNS Records overview

DNS Records in a Lync world (and their usage)
Automatic Sign-in Records (used by the Lync or Communicator client to locate a Lync or OCS server to sign-in)
  1.  _sipinternaltls._tcp.
  2.  _sipinternal._tcp.
  3.  _sip._tls.
  4.  _sip._tcp.
  5. sipinternal.
  6. sip.
  7. sipexternal.
Office 365 Sign-In Records (used by the Lync or Communicator client to locate the Lync Online server to sign-in)
  1. sip.
  2. _sip._tls.
  Lync Devices Records (used by Lync devices to locate a home registrar)
  1.   sipinternaltls._tcp.
  2.  _sipexternal._tls.
  3.  _sipexternaltls.
  4.  ucupdates-r2.
  5.  _ntp._udp.
 Lync Simple URL Records (used by Lync if DNS is the chosen simple URL configuration)
Federation (used by partners to automatically discover your Edge)
  Lync Mobility Auto-discovery Records (used by Lync mobile clients to auto-discover the Lync mobility service)
  1. Lyncdiscover.
  2. Lyncdiscoverinternal.
XMPP Auto-discovery Records

About Paul B

My name is Paul Bloem and I am employed at Lexel Systems in New Zealand as a Principal Consultant for Unified Communications. I have been working on enterprise voice solutions for over 20 years. My first 10 years were spent working for a Telco in South Africa (Telcom SA). This is where all the groundwork happened as I was exposed to just about every aspect of telecommunication you could imagine. I develop an interest in PBX technologies and eventually became the go-to guy. Next, I had a 10 year run at Siemens South Africa, most of my time there was as a Technical Trainer. During this time VoIP hit the world stage, I had the privilege of introducing VoIP both as H.323 and later SIP across the Siemens HiPath 4000 solution stack. In 2008 I immigrated to New Zealand with my newly attained MCSE, I was ready to go where no PBX Techie had gone before. I was employed to explore OCS 2007 and that was pretty much the beginning of the end for me. I have been working on OCS and Lync ever since. My current role focuses exclusively on Lync and associated technologies.. That includes pre-sales, consulting, architecture and design, training and support. I even get to play in the development space from time to time - focus on play ;-) I was nominated as a Microsoft VTSP for Lync early in 2013 and also awarded Microsoft's MVP award for Lync in 2014.
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