Hey @Derelict Thanks for the ideas. I've managed to find the issue, and it was an equipment problem on our ISP side. I ran some packet captures on both the internal VoIP VLAN, and the external SBC interface(our phone comes in over the same fiber asour IP, but on a separate interface on the demarcation unit(T-340)), found a lot of dropped packets, moved onto our WAN switch, and saw that there was an EXCESSIVE amount of Tx/Rx errors and collisions on the demarcation interface. When I dug into the interface itself, found that it was only negotiating at half-duplex, which would explain the issues. When I went back through my old config files for the SG-8860, I found that I had to force it into full-duplex mode as the T-340 for some reason will not auto-negotiate to full-duplex, but if I force my side to full, it works just fine, and not a single error since. Thanks again for chiming in. Marc

It's better to create a ticket on go.netgate.com and describe your problem

Hi Mate. Thanks for your response. I don't think so , the wan is set up statically and supplied by a data centre. The connection will be coming from another firewall VLAN. When we plugged the older pfsense in with the same config no issues were occurring. Just trying to look through the logs using shell due to the fact they only show a certain time in the GUI. Thanks

This won't answer all your questions but, I did find this on reddit: https://www.reddit.com/r/PFSENSE/comments/8hbsze/xg7100_performance_with_suricata_at_1_gbps/