# Dialogic® NaturalAccess™ Universal Speech Access API Developer’s Manual

The Dialogic® NaturalAccess™ Universal Speech Access API Developer’s Manual describes how to use the NaturalAccess Universal Speech Access API (USAI) to control MRCP services when developing applications that use automatic speech recognition (ASR) and text-to-speech (TTS) resources.

This manual also provides a detailed reference of Universal Speech Access API functions. This document defines telephony terms where applicable, but assumes that you are familiar with telephony concepts and the C programming language.

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