Can't listen to VoIP messages on Droid X

[dnargsiefil]

Hi,
just learned that the messages you can receive via e-mail from your VoIP provider can not be replayed on the Droid X (I think this is also true for other android phones).
Anyone found a solution to this? The message in teh player on my Droid X reads: "Sorry, the player does not support this kind of audio file."

Thanks Jens