Custom Asterisk auth

I'm gathering info for a project i'm working on, we wanna link our system with an asterisk server, one of the things i'm looking for is a module that can "hook" on the iax2 auth process, what i intend is to use other server to do the auth stuff (like, user sends user/pass to asterisk, asterisk sends it to a server B, server B process it and answers YES/NO, and so asterisk answers to the user YES/NO. Is this possible with a module or s开发者_如何学编程hould i modify the asterisk-core?

With IAX, you can optionally include dialplan ON ANOTHER SERVER. The other option would be to call the other server and let the second server handel the rest of the call.