FAQ: What are the modems successfully tested with zenon Message Control?
The list of tested modems is available in the pdf file attached.
Unfortunately, old analog voice modems are rare on the market and the drivers for these devices are not available for actual operating systems like Windows 10, Windows Server 2016, etc. Because of this reason it's recommended to use VoIP instead of voice modems if no compatible device or driver can be found for the Operating System you want to use. The VoIP is available since zenon version 7.50.