ऐसे कुछ प्रमुख खिलाड़ी हैं जिन्हें मैंने देखा या काम किया
है:
Voxeo: Early versions used the Nuance ASR but I
believe they use their own now. Uses VoiceXML and CCXML for call
control. They get expensive as you scale up but the development
license (2 ports) is free.
Loquendo: I only list this because a) I did
demo it and b) they have the best TTS engine I've ever heard.
Seriously worth a demo just to hear the quality.
Nuance Voice Platform (NVP): I work with this
almost daily. Nuance has by far the most powerful ASR on the market
but it comes at a big price. If you have to ask about price then
don't bother falling in love with the quality of the engine. It
uses a somewhat tweaked version of VoiceXML.
Microsoft Speech Server: You already know this
one of course. Bang for the buck it is a wonderful platform. The
VoiceXML support is borderline (limited control over the engine
from VXML properties) but if you're willing to use Workflows
instead you can do just about anything you want. The ASR is good
although it doesn't have near the accuracy with large or complex
grammars like Nuance. This is currently my preferred platform for
most applications. And like Voxeo the Developer license is
free.