Looking For Speech Recognition (ASR) Suggestions

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Asterisk Users 4 Comments

Is it correct that the unimrcp is the best approach for Asterisk and ASR/TTS?

Could anyone provide pros/cons for the various ASR options for Asterisk?
We need the ability for very large grammars (over 100,000 options). Because of this, my initial thought is Nuance or Lumenvox. Does this sound correct?

Have a great day!

Dan

4 thoughts on - Looking For Speech Recognition (ASR) Suggestions

  • Hello, you are correct. Very large grammars are only feasible with UniMRCP, and there is recognition quality to keep in mind too, which is far better on Nuance or Lumenvox than you can get with Pocketsphinx.

    We use Lumenvox with UniMRCP for most ASR use cases, but with 100,000
    options it might very well be the only solution for you.

    Mind if I ask what the 100k options are for? Person names for a directory?

    Best regards,

    Luca

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  • Hello, using UniMRCP and the MRCPRecog() dialplan function with “f” option (
    https://www.unimrcp.org/manuals/html/AsteriskManual.html#_Toc424230605), you can use ASR with Nuance/Lumenvox and have Asterisk play prompts locally. You can alternatively have the MRCP server play audio, but that does tie up ports and require you to copy the files over. We have done both in the past, but on Asterisk it is preferable to use local playback, it uses less resources and does not need to be managed.

    Best regards,

    Luca

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