My company BestFone uses FreeSWITCH for call routing. Self-serve panel at https://panel.bestfone.com (full stack: https://stackshare.io/bestfone-2-0/bestfone-2-0)

There's several main scenarios:

Calling card -- from several countries (USA/Canada/England/Switzerland) to worldwide.

Virtual Numbers -- from any supported country (Voxbone footprint) to worldwide.

Playback lines: archives of tele-conferences, with options to pause/rewind/skip forward.

I have a few custom-coded lua setups for time based routing, failovers, etc.

Most of my system is very simple freeswitch config that calls mod_xml_curl or a .js file that calls my remote API.

I used to offer ATA boxes, but both debugging NAT and delivering boxes is much less straightforward than the callingcard/virtual number setup.

Avi Marcus

BestFone