For others who receive these .wav files successfully, do they come up as a charge on your cell phone bill?
Also, Ooma only sends the voicemail attachments through email, it's not forwarded to your cell phone number.
You can also have a notification of a new voicemail sent to text or email.
I don't know how you set it up or how AT&T is handling it, but I've read that others can get their attachments through the email functionality of their cell phone.
Maybe it's just a notification that I am getting that I have a new voicemail message waiting on the server and/or in e-mail since I don't use mobile e-mail. Either way, I can just call my ooma number and press * to get my voicemail from my cell.