Dropping Calls - 25% packets lost

[MICRpro]

We are having major problems with our 3CX pbx. You can connect a call but within 10-20 seconds the app indicates recovering and get the double beep - all audio dropped. it will recover after another 10 seconds. We are self hosting. I had Fortinet on the phone for hours and eliminated a few things but could not solve the problem. This is out of the blue, no changes have been made to our network or pbx. Any suggestions as where to look?

 

[TheodorosG_3CX]

This will apply to external connections only or with internal as well?
Try also the Call Quallity Tool to get a more information on which side there is networking issue.

 

[MICRpro]

This happens with both internal and external calls. When I run the call quality tool, I get event ID 10034. This event isn't on the list of 3CX explained events. In longer calls I have multiple drops and recoveries.

 

[TheodorosG_3CX]

This is network related issue as something is blocking packets.

 

[MICRpro]

Any ideas on how to troubleshoot this? I've had Fortigate look at it and they feel like the PBX is the issue.

 

[TheodorosG_3CX]

The screenshots show that this is on both direction from/to the PBX therefore this has to be checked on the local network or the NIC of the machine.