What version of Wowza are you running?
Take a look at this article, more specifically the troubleshooting section:
How to re-stream video from an IP camera (RTSP/RTP re-streaming)
And it may help if you add this property to the RTP/Properties container in the Application.xml file
And lastly, looking at the specs of the camera, it is encoding in g.711 audio, which will only work with Flash RTMP and HTTP (HDS) clients.
For other clients you will need to transcode to AAC.
AddOn: Wowza Transcoder