We have 5 sites that connect to same FREEPBX server, but one site constantly (happens months apart) has issue that fixes by itself, I just waited a day or more to get it disappear and everything works normally again. Other 4 sites are operating now without this issue. Trying to get it fixed with Flowroute, my SIP provider, but every time they ask me for all info and tcpdumps from server or router (Edgerouter) they can’t tell me what’s going on.
how a can I troubleshoot this?
I reckon it is our ISP or the Flowroute and their peers that have bad routing.
I hope I can get to bottom of this before it fixes by itself again.
it can connect either through external IP or VPN, but primary way is VPN.
VPN is currently online, and extensions show as registered in asterisk info
401/401 10.abc.def.116 D Yes Yes A 5060 OK (72 ms)
403/403 10.abc.def.102 D Yes Yes A 5060 OK (67 ms)
404/404 10.abc.def.126 D Yes Yes A 5060 OK (66 ms)
405/405 10.abc.def.117 D Yes Yes A 5060 OK (60 ms)
406/406 10.abc.def.125 D Yes Yes A 5060 OK (60 ms)