If you pay attention, there is no interaction between Jane and Red John at the phone call. So I guess RJ made Patridge record this message and used it to misslead PJ.

Btw

For fun..

1) Newbie Killer Level = Patridge isn't RJ, the real RJ killed him....
2) Serial Killer Level = Patridge is RJ, he fakes his death...
3) Master Mind Level = Patridge isn't RJ, the real RJ killed him and will hide the body, so everyone will start thinging Patridge faked his death (2) and will blame him for being RJ...
4) Red John Level = Something else, because all that sh.i.t is previsible and RJ isn't.