In the left navigation of Microsoft Teams admin centre, go to Voice > Direct Routing, and then click the SBCs tab.
Click Add.
Enter a FQDN for the SBC.
Make sure the domain name portion of the FQDN matches a domain that's registered in your tenant, and keep in mind that the *.onmicrosoft.com domain name isn't supported for the SBC FQDN domain name. For example, if you have two domain names, contoso.com and contoso.onmicrosoft.com, use sbc.contoso.com as the SBC name.
