When I try to open one of these voice mails, K-9 mail pops up a very specific error message: "Unable to find viewer for audio/x-wav". I see that you're accepting audio/* here: http://git.videolan.org/?p=vlc-ports/android.git;a=blob;f=vlc-android/AndroidManifest.xml;h=d17a288c1783136e232ef1...
it'd be great if videolan were able to accept the mimetype of audio/x-wav for .wav files--voicemails from sipgate.de arrive with this mimetype, and for now I have to save them, and then open them from a file manager.