Let me know.
I've tried some commands on your website and done some tests but I can all the time make a call. I've tested the registrar and the credentials command on sip-ua configuration.
What I would like is that user will have authentication adn have to enter in their SIP applications some credentials that will be authenticate on the SIP gateway.
I've configured a SIP gateway and I would like to know if I can and how secure this gateway.