jasonbritlogo230.jpgDespite Britney Spears' manager denying that his client is the voice in the recordings claiming abuse, Brit's ex-husband Jason Alexander stands by his claim that he is, indeed, on the phone with the pop star.

In new audio released by Radar, the supposed voice of Alexander asks, "I mean, why isn't he in jail baby?"

The voice allegedly belonging to Britney replies, "Because I didn’t want the public knowing about it and I didn’t want to file anything, so everyone could find out. So I’ve just left him and changed my number.”

Previous audio the controversial conversation comes out just a day before Brit turns 29. Star Magazine's recent cover story, with a large photo of Britney, says, "Jason Beat Me Up."

As for the authenticity of the tape, Jason Alexander tells Star, "I completely stand behind my story … that is absolutely my ex wife Britney Spears on that tape."