All Attendant Console creators that are waiting for the same API so currently there is no native Teams compatible but there is some that allows attendants to be moved to Teams and running Teams client together with their software, but calls will be handled by a Skype server. The latest date I heard for the API is during H2 2019 or early 2020, but there is no official date.
During the Ignite session about Calling API Microsoft showed a number of third-party applications that been in the TAP for Calling API to create Contact Center and Attendant applications. I've been working with some of them and there is some minor issues in the API but it works for most companies at least for start to test. One thing that is an problem is forwarding calls to another PSTN-number, but that should work soon.
The API is in limited preview currently, if you contact any of the application providers they might be able to include you in their preview but I know that most of them have a long queue with customers that want to start testing.
For the list of third-party applications check my tweet here: