Windows-driver-samples/network/modem/fakemodem/README.md

page_type	description	languages	products
sample	Demonstrates a simple controller-less modem driver.	cpp	windows windows-wdk

Fakemodem Driver

The Fakemodem sample demonstrates a simple controller-less modem driver. This driver supports sending and receiving AT commands using the ReadFile/WriteFile calls or via a TAPI interface using an application such as HyperTerminal.

Universal Windows Driver Compliant

This sample builds a Universal Windows Driver. It uses only APIs and DDIs that are included in OneCoreUAP.