Known issues in Azure Communication Services calling Call Automation API

• The only authentication currently supported for server applications is to use a connection string.

• Make calls only between entities of the same Communication Services resource. Cross-resource communication is blocked.

• Calls between tenant users of Microsoft Teams and Communication Services users or server application entities aren't allowed.

• If an application dials out to two or more PSTN identities and then quits the call, the call between the other PSTN entities drops.