That error is irrelevant, the result of some hacker using automated tools on a system in Canada attempting to access your system. Assuming that you have strong passwords, you don’t have to worry about these guys yet. Eventually, you can set up FreePBX firewall to block them.
What I asked for is the complete Asterisk log for a failing call, including pjsip logger. It’s typically several hundred lines. Paste it at pastebin.freepbx.org and post the link here.