VTScada should work with any standard voice modem. Though we cannot guarantee the compatibility of third-party modems across all Windows operating systems, our engineers have provided the following comments on modems that they have used or have been used by our customers. We have no relationship with these manufacturers.
Note that fewer legitimate manufacturers are offering physical modems. There will likely be none in the near future. For voice alarm notifications, we suggest using Twilio.
- US Robotics 5637 – The voice quality is good however they sometimes miss a user’s key press on the phone. In early 2020, we will provide a solution that will give an audible feedback on each key press so users can press the key again if it was missed.
MultiTech MT9234MU-CDC-XR – Built for industrial applications, this modem has high voice quality and DTMF detection is consistent. Ensure model number does not contain ‘NV’ (no voice). This device has been discontinued but may still be available second hand from sites like eBay.
Zoom V.92 56K USB Mini External Modem - Model 3095
Tests in February 2020 indicated this device works with the current Windows 10 driver from the ZOOM website. http://www.zoomtel.com/products/dial_up_external_usb.html
For more information, see the VTScada help file entitled, "Modem Configuration and Use."