@BlazeStudios it was with that knowledge in mind that led me to the suggestion - please do not assume thought was not given as that was not the case and you are making an incorrect assumption
until 11.20.1 is released, if someone has a problem with peers going unreachable and cant explain it they should downgrade go 11.19.0 and determine if the issue persists -
https://issues.asterisk.org/jira/browse/ASTERISK-25476
"In Asterisk 11.20.0 chan_sip looses registrations of some IP-phones (on several different systems) after a while. In Asterisk the phone then shows "unreachable", while the phone's status shows "Registered". Reverting back to Asterisk 11.19.0 solves the problem. The phones are mostly Yealink phones, different models with different firmwares on different systems, none of the phones firmware was recently upgraded. Dis-/enbling the phone's SIP account or rebooting the phone makes it work again for a while, but then Asterisk shows the phone again as unreachable.
I attach a SIP trace of a Yealink W52P DECT base with 2 handsets (331/332). "qualify=yes" is enabled, after a while Asterisk stops sending Option packets to ext. 331 while keeps sending packets to 332."
@dicko - as Lorne described this is a tricky one - i've only seen it 4 times but each of those were resolved with the downgrade; asterisk-version-switch makes this trivial ...