EAP-TTLS Anonymos Outer Identity

Hi All, If I'm not mistaken this is set on the client side, however, how would I make it so that the anonymous username is sent as the outer identity and the real username is then sent as the inner identity? The server is functioning fine as it is, the TTLS tunnel gets initiated and by the looks of it the username and password are tunnelled within the tunnel and authenticated by PAP/MD5. Kind regards, Connor