To benefit the community, posting our offline discussions.
Our ACS product team has announced the latest API, which is now available in public preview. The new API provides additional features like managing inbound & outbound calls, the ability to play audio and gather user input in a call, among others.
We recommend you to update to the new SDK (.NET: NuGet, Java: Maven) for your use case.
Here are some additional resources that might be helpful: learn about the new SDK and recording calls.
Much appreciate your patience, feedback and collaboration!