Set up DNS records for Cloud Office Skype for Business

  • Last updated on: 2019-01-16
  • Authored by: William Loy

This article describes how to set up DNS for the Skype for Business offering from Rackspace Cloud Office. If you need to configure your DNS for Rackspace Cloud Office email products, see Set up DNS records for Cloud Office email.

Prerequisites

  • Applies to: Administrators
  • Difficulty: Moderate
  • Time needed: Approximately 30 minutes to configure and an additional 24-48 hours to propagate
  • Tools required: DNS host administrator access

For more information on prerequisite terminology, see Cloud Office support terminology.

Set up DNS records for Skype for Business

To configure your hosted implementation of Microsoft Skype for Business, formerly Microsoft Lync, you must set up DNS records. The following CNAME and SRV records must be in place to enable Skype for Business to work with the Hosted Exchange environment.

CNAME records

  • autodiscover.example.com
  • lyncdiscover.example.com
  • sip.example.com

SRV records

  • _sip._tls.example.com
  • _sipfederationtls._tcp.example.com

Because of the nature of our hosted environment, the domain listed for the CNAME records contains specific Skype for Business DNS records. Use our help tool for the specific DNS records for your domain.

After you log in with a mailbox that is enabled for Skype for Business, you can find the DNS settings through the Help Tool as shown in the following image.

If you know exactly which Exchange environment your domain is hosted on, you can locate your specific records in the tables below.

mex06.emailsrvr.com

Type Hostname Destination Time to live (TTL)
CNAME autodiscover.example.com autodiscover.emailsrvr.com Lowest possible
CNAME lyncdiscover.example.com lyncdiscover.mex06.emailsrvr.com Lowest possible
CNAME sip.example.com sip.mex06.emailsrvr.com Lowest possible
Type Host Destination Service Protocol Port  
SRV example.com lync01.mex06.emailsrvr.com _sipfederationtls   _tcp 5061
SRV example.com sip.mex06.emailsrvr.com _sip _tls 5061  

mex08.emailsrvr.com

Type Hostname Destination Time to live (TTL)
CNAME autodiscover.example.com autodiscover.emailsrvr.com Lowest possible
CNAME lyncdiscover.example.com lyncdiscover.mex08.emailsrvr.com Lowest possible
CNAME sip.example.com sip.mex08.emailsrvr.com Lowest possible
Type Host Destination Service Protocol Port  
SRV example.com lync01.mex08.emailsrvr.com _sipfederationtls   _tcp 5061
SRV example.com sip.mex08.emailsrvr.com _sip _tls 5061  

mex09.emailsrvr.com

Type Hostname Destination Time to live (TTL)
CNAME autodiscover.example.com autodiscover.emailsrvr.com Lowest possible
CNAME lyncdiscover.example.com lyncdiscover.mex09.emailsrvr.com Lowest possible
CNAME sip.example.com sip.mex09.emailsrvr.com Lowest possible
Type Host Destination Service Protocol Port  
SRV example.com lync01.mex09.emailsrvr.com _sipfederationtls   _tcp 5061
SRV example.com sip.mex09.emailsrvr.com _sip _tls 5061  

Note: If you have an internal DNS, you must also set up these records on your internal DNS. If you want to enable Skype for Business federation with domains that are hosted outside of Rackspace or domains that are hosted within Rackspace, contact our Support team to learn more.

Related article

Set up DNS records for Cloud Office email

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