The recording features a man saying "Patient is Michael Jackson, the pop star singer ... we should be there in five minutes. It doesn't look good."
But TMZ spoke to L.A. City Fire Dept. Captain Steve Ruda who told us, "It is not our conversation. It is not any of the paramedics who treated Michael Jackson."
We're told there are several indicators on the tape which show it could not have originated from an L.A. City Fire employee.
We're told officials are not supposed to name the patient and the terminology used in the recording is not consistent with terms used by the department.