Mr dupondt posted the process how to add an url to the soundbridge.
I think your question is: I've added the link http://www.avalonradio.nl
, but it doesn't play on the soundbridge.
I must admit, I didn't ran a snoop on the given url, though it looks to me that either your codec is the problem (Though it seems to be according to specs), or the meta info provided by your streamer software has some things not set.
I tried to play the given stream url on my server, which outputs your stream as MP3 and re-streams it to my soundbridge.
This re-fromated stream works.