I noticed, that the loop function of the rtp-sender module is not functional. I tested this on multiple machines, with and without paprefs. It must be a problem of pulseaudio. Note: Turn off all RTP receivers, otherwise you will get a loopback through its own receiver (which is my current workaround). The setup: load-module module-null-sink sink_name=rtp format=s16be channels=2 rate=44100 sink_properties="device.description='RTP Multicast Sink' device.bus='network' device.icon_name='network-server'" load-module module-rtp-send source=rtp.monitor loop=1 Running 12.2-2 on ArchLinux with 4.18.8-arch1-1-ARCH ~ Nico
