DNS Requirements for Direct Routing

DNS Requirements

To enabled Direct Routing you must meet the following DNS Requirements:

  • Each SBC must be assigned a FQDN from a registered domain name of the tenant.
  • You can not use the onmicrosoft.com domain,
  • You should not use sip.<_domainname_>
  • The SBC can service users from any Registed Domain Name.

Example SBC Domain Name

FQDN Type Value
{ sbc FQDN } A { sbc ip address }
lyncdiscover.{domain} CNAME webdir.online.lync.com

Quick Tip : Each SBC must have a unique Public DNS address.