Nah, audio evidence would be of the calls themselves. All we have is Envy and Charlemagne's fakkit ass saying he did, that's not proof, that's hearsay.
Then nikkas bout to fukk around and force Birdman's hand

If he did call to apologize, it was merely political and he was extending the olive branch so shyt wouldn't have to come to certain levels. Them refusing another interview is one thing, but if they get back to shytting on him, shyt's definitely gonna spill outside of that radio station

nikkas don't realize they're safe in that station on camera alone. Charlemagne wants to act like a bunch of dusty ass random local nikkas didn't have him sprinting in the street, let alone what's gonna happen if Birdman and his entourage pull up on him