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Listen to .wav files on Iphone 4

HD LF asked
We send .wav files via email from Cisco Unity Connection to our employees.  I have an employee with an Iphone 4 that can download some of the .wav files and listen to them but he can not download others.  
Watch Question

Both Cisco and Apple do not have a fix for this yet. It appears to be centered around the G.711 wav file format.

Can the cisco unity device change the format to any other format other than wav?