Voicemail Example application from Telephony Workshop:
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This file contains source code for a TSP that works with AT+V modems (such as 
those from Zyxel and other vendors), as well as a rudimentary voicemail 
application that uses this service provider. 

The ATVSP driver demonstrates basic detection and handling of an incoming call
as well as a driver that provides both a TAPI functionality as well as a 
Media Control interface.

Feedback to TAPI@microsoft.com.