I have been using ConfBridge since Asterisk 11, and I recently upgraded a server to 13. While everything that needed fixing seems fixed, I have an issue that does not seem documented anywhere.
The way I used ConfBridge is that I have a standard bridge profile, user profile and menu that (almost) everyone uses. I call the ConfBridge this way:
exten => s,1,Confbridge(some_id,bridge_basic,user_basic,admin_menu_basic)
But, even though everyone uses the same basic config, each conference has a different NIP to get it. So what I USED to do is this:
exten => s,1,Set(CONFBRIDGE(user,pin)=123456)
exten => s,2,Confbridge(some_id,bridge_basic,user_basic,admin_menu_basic)
This, as far as I could tell on Asterisk 11, meant that the user_basic profile was used, but whatever default PIN present in confbridge.conf was