[Freeswitch-users] a1-hash for reverse-auth-pass

Guys, I think you all know there is perfect thing like a1-hash which allow us don't keep passwords as plain text.But what about reverse-auth-pass ? I really use this feature a lot. reverse-auth-pass should be equal a user's password as far as I know.How can I don't keep reverse-auth-pass as plain text as well ? Any thought?Thanks.