According to the specifications this camera only support MJPEG which includes video, but no audio. To have video and audio in the same stream it needs to support h.264 or MPEG4. In Edimax own software they have video and audio, but then they use 2 different streams, probably rtsp for video and http for audio. How they do that is a secret of Edimax.
However, if you go to the configuration of the camera you have a menu called RTSP that I found in the manual.
There you have how to connect to the camera, but if that also includes audio I do not know. Add the camera using the Custom URL:
-set Stream type to rtsp_tcp
-use this URL rtsp://username:password@ipnumber:554/ipcam_mjpeg.sdp
This should at least give you video. This do not include PTZ.
you can also try this:
Check also if there is a new firmware for the camera on http://www.edimax.com/edimax/download/download/data/edimax/in/download/for_home/home_network_cameras/home_network_cameras_indoor_ptz/ic-7001w
Sometimes they upgrade the cameras to have more features.