3CX v20 - Can't edit SIP trunks

When trying to edit a SIP trunk on version 20 of 3CX you are redirected to the People screen/user list. This occurs because 3CX tried to aggressively push you towards their preferred SIP providers by creating this error in unsupported configurations. Luckily the fix is reasonably simple, but unfortunately can't be completely done via the web interface. You will need to

1. Under Admin, Voice and Chat, locate the trunk with the issue.

   1. Click on the dots at the end and select export

   2. Rename the downloaded file to the xml filename located in the xml itself.

      1. eg - Commander.pv.xml in our case.

2. Use WINSCP or similar to connect to 3CX and upload the file to

   /var/lib/3cxpbx/Instance1/Data/Http/Templates/provider.

3. Note the filename must match the SIP trunk name to fix this issue (with the suffix .pv.xml) - ie It is your TrunkName.pv.xml

   
   

Once this is done you should be able to edit the SIP trunk again via the webui, usually there is no restart necessary.