Recording sound from a connected USB microphone

I have router GL.iNet GL-AR300M16 with USB interface. I want to record sound from a microphone connected via USB. Are there packets to do this?
Broadcasting USB-over-IP is not suitable, because the provider issues a gray IP address and it is impossible to connect to the router via IP remotely

Sure, you need to install the required kernel modules (kmod-usb-audio and maybe some specific ones) and utilities for recording (for example arecord from the alsa-utils package).

See the wiki for more details: