Looking at your media_config below;
Room=1: AudioDev=16; VideoDev=132; KeepScreenOnForOSD=yes
Room=2: AudioDev=194; VideoDev=193; KeepScreenOnForOSD=no
Room=8: AudioDev=111; VideoDev=128; KeepScreenOnForOSD=no
Room=9: AudioDev=144; VideoDev=165; KeepScreenOnForOSD=no
Room2's AudioDev should be set to #171 as that is the AppServer for that Rooms MM (its currently set to another device which is an MM and not an App server)
Make that change to device #171 for Room2 and I think you will get the desired result.
All the best