Don't try this @home!!!

Comment out the only line in

/etc/modprobe.d/dist-oss.conf

Then add this extension to your dialplan:

exten => 912345,1,Dial(console/dsp,20)
exten => 912345,n,Hangup()

Reload your server and call the 912345 extension: you've just turned out your system into a stealth microphone that silently broadcasts your voice to any logged in user...