Icecast + darkice + AAC

Hello, i have airtime up and running and i have contract an audio streaming server wich gives me this details to conect to theirs server:


ServerType=Icecast2
Server=91.121.***.**
Port=8000
ServerPassword=****
ServerMountpoint=/marbellaon
Encode=AAC PlusBitrateNominal=32

*: hidden numbers


i was suggested of using for linux solution one of this encoders.
http://www.icecast.org/3rdparty.php

i decided to use darkice because support ACC format, i am trying to configure the darkice to conect with the streaming server without succes.

i hace two questions:

what it menans the localdumbfile in the darkice configuration file?

do i really need darkice to conect to the streaming server as i was suggested?. Because the company doesnt know airtime and dont know how it works and the only allow format is AAC.

Thanks a lot for the help.