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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