Welcome to the second part of Asterisk Speech Recognition 101. We're going to continue talking about building your first speech app on Asterisk. First, let's talk about some of the different types of speech recognition applications that you normally build. There are two categories:
Natural Language Applications: Ask open-ended questions and allow for a large range of responses.
Directed Dialogue Applications: Use prompts that guide the user to give specific responses.
A generic speech API (res_speech) was introduced in 1.4. A patch exists for 1.2. This provides a number of dial plan applications related to speech (app_speech_utils). These are also available via AGI.
To tie a speech recognition engine into the Asterisk speech API, a second module is needed: the Connector Bridge. The connector for the LumenVox Speech Engine is res_speech_lumenvox.so. It was developed and is maintained by Digium.
In Part 3, we'll talk more about what grammars are and how to write them.
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