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.