This conversation has been merged. Please reference the main conversation: User Settings: Disable call waiting while on a call.
When on a call, we need a way to silence another incoming call rather than just having it ring while we are busy with the current call. It is inconvenient and needs to be addressed as soon as possible. It makes it difficult to concentrate fully on what's currently being done, when you have another constant call that you cannot currently attend do bothering you.