[internal]
exten => 200,1,Answer()
same => n,Playback(demo-congrats)
same => n,Hangup()
exten => 201,1,Originate(Local/200@internal,app,ConfBridge,6001)
exten => _6XXX,1,Verbose(${CALLERID(num)})
same => 2, Originate(PJSIP/${EXTEN},app,ConfBridge,${CALLERID(num)})
same => 3,Answer()
same => 4,Confbridge(${CALLERID(num)})