All My Extensions are suddenly UNREACHABLE

Hi I am new to FreePBX and would like to ask for your assistance because all of a sudden all my extensions become UNREACHABLE. My port forwarding are still in the router, however even if its in the local area network my device shows its registered to my FREEPBX however, it shows Unreachable. Where do I adjust this? Lastly, in my dashboard it says something like Chan_sip port had changed to 5061.

PBX Version:15.0.17.34
PBX Distro:12.7.8-2104-1.sng7
Asterisk Version:16.17.0


you’ll need to review /var/log/asterisk/full logfile(s)

login to console, asterisk -rvvvv
and see whats going on
if you need to when logged into asterisk shell, run (as you seem to be using the old chansip) sip set debug on