I installed a2bliing and the callback module. All looks fine. A2B is trying to call back after hanging up the line. But I see "Connect attempt from '127.0.0.1' unable to authenticate" in the log. I checked the call queue and the callback entry is there. I have a2billinguser/a2billing in manager.conf which matches what is in a2billing.conf. How can I tell what creditials the callback module is trying to use to connect to asterisk manager?