Is it possible to use the transfer request? However, this request requires a SIP address as a parameter. I’m not sure what will happen if I use the master session’s address when there’s a helper session.
To learn more about how transfers work, you can refer to this presentation I made at the time (the slides are available here), as it shows a couple of examples of the API in action.
Thank you for your answer, I will test the effect when I have time.