asterisk users - Feb 2005 - Secure IAX Interasterisk authentication ?

Hi,

I wonder if I can securely authenticate two Asterisk servers with IAX
connection. I know for RSA authentication for IAX2 channel, but that seems
to be meant for peer authentication...

Has anyone done RSA (or any other secure way) authentication between two
Asterisk servers ? Any example ?

Thanks in advance,

regards,

Rob.