Confrence Call password

How can I make it so you have to enter a password to get into a confrence call? I was thinking about creating an extension that was pasword protected and then pass it off to the confrence number. Any ideas? I am new to asterisk so be easy on me. :laughing:

Password are optional in meetme.conf, example below

conf => 1234,4321

1234 is the conference room
4321 is the password