We are standing up a new FreePBX server and are testing calls. The current issue is randomly, incoming calls will stop working and result in the caller getting a “number unavailable” notification. On every occurance, restarting the FreePBX server fixes the issue. Outgoing calls appear to be working normally even when incoming are not.
We have checked the network firewall and ensured ports are opened as well as SIP_ALG is turned off. Support from our trunk provider said the calls are being passed from them to us without issue. When our CDR is checked in the PBX server, no calls are showing when the issue occurs. When this happens every line will not receive incoming calls regardless of what external number is dialing in.
Does anyone have any insight on what might be the cause? It looks to be the actual PBX server, but incoming routes look correct, and it works between these reboot cycles.