ll(core, "Everything that isn't part of another subsystem")
ll(spandsp, "Log messages generated by SpanDSP directly")
ll(ffmpeg, "Log messages generated by ffmpeg directly")
ll(transcoding, "Media and RTP transcoding")
ll(codec, "Codec negotiation")
ll(internals, "Noisy low-level internals")
ll(dtx, "DTX timer/buffer")