Has anybody out there used a Comrex ACCESS to push audio to Wowza? http://www.comrex.com/products/access.html

I have a customer that has one of these units that they normally use paired with another at a radio station to send audio for radio broadcast. It has ability to do push-pull RTP, and it looks like a shoutcast compatible HTTP pull as well, but so far we haven't had any luck getting it to talk to Wowza. Since you can't configure an app, channel, or auth other than a password, it seems like pull and a stream file may be the only option, but it would be great if somebody could give some pointers.