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Deprecated - Asterisk Main Help Page

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Deprecated Content

This page refers to outdated, obsolete, or deprecated products or software. This is provided for historical reference for users of older releases.

Getting Started

The LumenVox ASR was the first commercial ASR product to be integrated with the Asterisk PBX voice platform. This integration was initially performed by Digium, the maintainers of Asterisk, and the design of the Asterisk speech recognition interface was influenced by this integration.

A standard Asterisk module called provides a set of Asterisk dialplan applications that can be used to perform speech recognition functionality. These include SpeechBackground(), which functions similarly to the common Background() application. Where Background() plays an audio file and waits for DTMF entry, SpeechBackground() plays an audio file and waits for either speech or DTMF entry.

A special Asterisk module,, is written by Digium and distributed by LumenVox that provides a connection between the Asterisk dialplan applications and the LumenVox ASR (this module is commonly referred to as the “Asterisk-LumenVox connector bridge”). In the time since this was initially developed, an open source project called UniMRCP that leverages the open Media Resource Control Protocol (MRCP) developed a set of Asterisk modules ( that also connect the Asterisk dialplan applications to the LumenVox ASR.

To use ASR on Asterisk, users may make use of either the Digium-maintained or the community-maintained UniMRCP solution. Digium provides support for its solution while the UniMRCP solution, being a free, open source project, has no official support. The primary reason to make use of the UniMRCP solution is that it provides text-to-speech (TTS) functionality in addition to ASR functionality. There is currently no officially-supported method of using TTS with Asterisk, so many in the community leverage the UniMRCP modules for this purpose.

Looking for Release Notes or Something Else? This document mainly covers the LumenVox-Asterisk integration. See our full Engine Help for a more detailed reference to the LumenVox software, including complete release notes for each software version.

Before you begin installation

Read these notes first if you are unfamiliar with using LumenVox:

Configuring licensing

LumenVox has flexible hardware-based licensing.

Configuring Speech Engine parameters

Configuration for the LumenVox Speech Engine on Asterisk is largely controlled by the lumenvox.conf file.

Currently known issues

Current Issues with the software.

Installing the LumenVox software

How to download and install LumenVox using RPMs or YUM.

Connect the Speech Engine to Asterisk

The LumenVox Speech Engine communicates with Asterisk via a "connector bridge."

Upgrading the software

LumenVox releases regular versions of its products. When you first purchase a license for a product, you receive free upgrades for that license for one year.

Getting started writing Asterisk apps

Developing speech applications in Asterisk with LumenVox is a pretty straightforward process.