I am running Asterisk 1.2.26 (through Trixbox actually). How can I prevent clients (SIP phones in this case) from registering from the outside world? Someone brute forced a password for one of our phones and was making outbound calls.
I read that permit= can be used in sip.conf, but I don’t see a place to put this in the trixbox interface, and I think it will just get overwritten then. Is there a way to do it globally? I think there are some sip_* files I can edit that don’t get overwritten by trixbox.