Good way to troubleshoot remote phones not connecting

I’m having some issues with phones (sangoma S705) at remote locations going offline and showing “network down”. Is there a log I can look at or something else that could quickly pinpoint the problem? Currently, I’m just checking that the remote location’s IP didn’t change, then searching fail2ban logs. After that I’m kind of at a loss for what to check.

Not pinpoint the problem just the time

egrep  -i "reachable|lagged"  /var/log/asterisk/full*

Thanks, that is helpful

What firmware version? Newest?

Check both firewall if they kill SIP sessions

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