The fact that CNN has these 2 analysts on means that they also believe the audio could be a hoax...
The first guest, who is former LAPD thinks someone is trying to punk CNN and says 'I’ve told your producers that for all I know this is one of Howard Stern’s punk people'
The second guest is a CNN law enforcement analyst, he concurs with the officer
Video via Noah Rothman, who says -"If this audio does turn out to be inauthentic, it would be another opportunity for CNN to learn the lessons of their saturation coverage of the missing Malaysian passenger airliner; sacrificing credibility for ratings is never a good tradeoff"
Watch- Is it a hoax?