Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A voice engine is a software subsystem for bidirectional audio communication, typically used as part of a telecommunications system to simulate a telephone. It functions like a data pump for audio data, specifically voice data. The voice engine is typically used in an embedded system. The term became popularized after 2000 with the proliferation of voice over internet protocol technology in software DSP systems. Voice engines handle the voice processing for an IP Phone system on a standard processor, compared to prior generations of systems which required dedicated, math-optimized digital signal processor chips