How do you receive them? As attachments in mail?
The iPhone should be able to play the wav files.
I just did a quick test sending myself a wav. The file appears as a box with the file size listed and a download arrow. I clicked on it and it loaded then opened in another screen and played.
I have this same issue. I have Vongae phone service. when I recieve a voicemail attachment and I try to play it, it says that it could not play this movie. Any Ideas?
I had the same problem with my Asterisk (Trixbox) PBX; the wav file was actually WAV49 (compressed WAV) format (which also explained why the mail folder had duplicate files, *.wav and *.WAV, one much bigger than the other). I changed it to email the standard WAV format email instead; it worked, with the tradeoff being the attachments were about 10 times larger (still fairly quick over Wi-Fi, and still usable over EDGE).
The iPhone plays some .wav files. See this third party app note for details:
< <a class="jive-link-external-small" href="http://">http://www.kehlet.cx/articles/156.html>
I encountered difficulty when forwarding my AT&T home voicemail to my AT&T exclusive iPhone (so much for corporate compatibility). The messages are in G.711 format and thus are unplayable on the iPhone. It turns out that G.711 is the most popular .wav implementation for telephony and voicemail.
If you have the ability to change the voicemail system's output, that is a good solution. Otherwise, the only workaround I found was signing up for an account at www.iphoneconvert.com. This service reformats the voicemail into an iPhone supported format and forwards it to the iPhone.
Hopefully, Apple will add G.711 and other missing .wav support in software 2.0 (or a future update).
I just tested Asterisk Mail again with my upgraded phone; it now supports wav49 format. (Also, an update to http://www.kehlet.cx/articles/156.html states that G.711 now works as well.)