In this post I highlight a Microsoft Teams Calling feature to safely transfer calls. Microsoft seems to add safe transfer for calls by Teams Users soon, according to the Microsoft 365 roadmap.
What’s safe transfer with Microsoft Teams?
As the roadmap item says it enables Team Users to get a call back if the Teams User transferred it to another Teams or Skype for Business user which does not answer.
That this works it is required that the user who transfers the call is a Microsoft Teams user and the target must be a Microsoft Teams or Skype for Business user in the same or federated tenant.