Queue music on hold

right i want calls to be put into a queue
ring for 30secs
if not answered pushed onto voicemail

i have this set up like this so far

exten => 1000,1,Queue(queuename||||30)       
exten => 1000,2,Voicemail(1050@default)
exten => 1000,3,Hangup

only issue is i keep getting the default dualling guitars music on hold
with the music on hold commented out in queues.conf and agents.conf how do i stop it?!

i know its prob something stupid i missed thanks

exten => 1000,1,Queue(queuename|rt|||30)

thanks for the quick reply Ian

i go tit to work using exten => 1000,1,Queue(queuename|tr|||30)

thanks for the help