I will try to summarize to avoid previous conversations on this topic. Supporting the recording and playback of opus format files is difficult to impossible. This issue stems from the fact that opus is a stateful codec. This translates into the reality that attempting to simply inject the opus bitstream into a current call can result in a mismatch of the parameters giving an inaudible playback. The stateful codecs not only vary from call to call but can change within the same call. I have already gone down this road and it is a dead-end.
Jonathan