Lync SRV Records


I was configuring a new Edge environment today and thought I’d done it enough times not to have to refer to my notes. It was at this time that I realized that I hadn’t clearly documented the different SRV record options…only noticed as I had to take a peek 🙂

Internal DNS SRV
_sipinternaltls._tcp.  #for each sip domain (multiplied by each Front End Server)
If not using split brain DNS it is wise to add a sip. A record (I usually add it either way)

External DNS SRV
_sip._tls.    #for each sip domain
_sipfederationtls._tcp.  #for each sip domain

HOWEVER…
I did come across an environment that didn’t have the ability to add SRV records externally and were  not using split brain DNS.

External DNS add the following:-
       sipexternal. point it the the Edge Server Public FQDN (the consolidated name also works as long as its in the certificate as a SAN)

Internal DNS add the following:-
     sip. pointing to the Front End Server

More details on SRV records…

Lync Auto login SRV Record
Service: _sipinternaltls
Protocol: _tcp

Priority = 0
Weight = 0
Port Number: 5061
Host:

OCS Auto login SRV Record
Service: _autodiscover
Protocol: _tls

Priority = 0
Weight = 0
Port Number: 443
Host: sip.

Federation (Autodiscover)SRV Record
Service: _sipfederationtls
Protocol: _tcp

Priority = 0
Weight = 0
Port Number: 5061
Host:

PB

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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.
This entry was posted in DNS, Lync Edge, SRV, SRV Record. Bookmark the permalink.

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