Many VoIP based phones, gateways, and servers use a Linux operating system as it is much more stable than windows. Experience with Linux, and C and C++ programming will allow you to work on almost any application in VoIP. As an example, the ZIP 4x5 IP phone from Zultys Technologies:
This phone runs real time Linux on an IBM 405GPr Power PC. Our developers use C++ to create a wealth of functions for the product.
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