I've Samsung Galaxy S10e (SM-G970F) smartphone with the latest firmware (security patch level: November 1, 2020). A few days ago I started to use Wi-Fi calling and noticed that when the Wi-Fi calling is in use the Call recording button is disabled and I can't record my conversation. If I disable my Wi-Fi connection (even during a current call) the call recording button becomes enabled.
It seems like a bug. Could Samsung fix it in the next firmware update?
Wi-Fi calling should be very similar to VoLTE. In both modes the call uses some TCP/UDP/IP connection but only Wi-Fi calling has the above restriction that seems like a bug. With VoLTE that is also enabled and in use in my phone (when Wi-Fi is unavailable) any call could be recorded without any trouble.