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
Quick Tip : Each SBC must have a unique Public DNS address.
Direct Routing Explained
This Direct Routing Cheat Sheet is a condensed overview to planning and deployment of Direct Routing in Microsoft Teams.