Screen recording phone and Discord calls with sound

How can I screen-record phone or Discord calls with sound? I tried the in-built screen recorder and the set of task-related apps but unfortunately the first does not work and the second type either screen records soundlessly or does not screen record at all when it comes to calls. How can I manage to circumvent the whole block? Does it relate only to Android or every system? I want to record on the device itself and not with another device.