Dialing out to POTS device?

Hi,

We have to dial out to devices in the field that are only accessible via POTS. We currently do this with a real modem connected to a real server via a USB com port cable. The server is on its last leg and everything else we have are VMs.

I’d like to replace that setup with a device that plugs into a real phone line and presents itself as a network resource that can be used by software running on a VM. I’m not sure what you call such a device, modem over IP/Ethernet?

Does anyone know of such a device? How are large organizations doing dial out to field devices via POTS? I know there aren’t a ton of people doing this anymore, but there must be some.

Thanks!