A great practical step forward for PSTN Carriers and Microsoft Partners that offer Direct Routing as a service for multiple customers.
A carrier can:
- Deploy the SBC and configure it for the hosting scenario according to the instructions from the certified SBC vendors.
- Register a base domain name in the carrier tenant and request a wildcard certificate.
- Register a subdomain for every customer, which is part of the base domain.
The SBC requires a certificate to authenticate the connections. For this SBC hosting scenario, the carrier needs to request a certificate with SAN *.base_domain (for example, *customers.adatum.biz). This certificate can be used to authenticate connections to multiple tenants served from a single SBC.
Full details of how to configure the SBC for this hosting scenario are here: https://docs.microsoft.com/en-us/microsoftteams/direct-routing-sbc-multiple-tenants#create-a-trunk-and-provision-users
