Cool, I did that yesterday and test it and the recording play fine but I set the redirect at 20 sec and the phone did not redirect, the recording was just looping over and over.
Here are the step I took.:
Create the auto attendant 150 and select ivr on auto attendant where I upload the recording.
I disable the feature say "please enter the extension number"and the two option below it
In my hunt group I add the Service flag account I created with the time and Night Service number 150(auto attendant)
I set the redirect to 10 sec for ext 100