exten => 30,1,Answer()
exten => 30,n,Background(eingabe)
exten => 30,n,Hangup()

exten => _[13579],1,Playback(ungerade)
exten => _[13579],n,Hangup()

exten => _[2468],1,Playback(gerade)
exten => _[2468],n,Hangup()