Vestec is a Premier Partner of Digium, the creator of Asterisk.
The Vestec Speech Engine offers the best value around for enabling speech recognition with Asterisk. The connector bridge for Asterisk is included in the price of the engine. We support all major Asterisk releases and Linux distributions, including:
For Asterisk 1.4 and 1.6:
Vestec speech engine for Asterisk can be purchased from Digium at:
http://www.digium.com/en/products/software/vestec.php
Vestec product information for Asterisk and Digium Premier Software Partner designation can be viewed at:
http://www.digium.com/en/ecosystem/marketplace/marketplace.php
Tier-1 installation support for Vestec speech engine for Asterisk is available from Digium at:
http://www.digium.com/en/supportcenter/
Tier-2 installation support as well as non-installation support is available from Vestec at: support@evestech.com