[asterisk-users] Simple speech recognition for driving IVR - "press or say one".

Jurijs Ivolga jurijs.ivolga at gmail.com
Wed Dec 6 08:46:29 CST 2017


I was able to achieve this using:


I needed to change code, so it wasn't working out-of-the-box. I did this
couple of years ago and unfortunately I do not have code anymore. But it
wasn't too difficult.

With kind regards,


On Wed, Dec 6, 2017 at 4:33 PM, Jonathan H <lardconcepts at gmail.com> wrote:

> Briefly: I want to be able to have "press or say (number)", with
> Asterisk listening for a spoken number, but accepting a DTMF digit,
> too.
> I'm posting everything I found so far, here, partly to show working,
> but also in case anyone else finds it useful. So, moving on....
> This looked hopeful for a moment until I realised that it doesn't do DTMF:
> https://wiki.asterisk.org/wiki/display/AST/Asterisk+15+
> Application_SpeechBackground
> So then there's
> https://wiki.asterisk.org/wiki/display/AST/Asterisk+15+Application_Record,
> which can terminate on any DTMF key with "y", but according to the
> docs, "RECORD_STATUS" only sets a flag of "DTMF" (A terminating DTMF
> was received ('#' or '*', depending upon option 't')).
> So, I don't get to know which key was pressed via that method, either.
> There's very little information I can find about the built-in
> functions for speech recognition.
> https://wiki.asterisk.org/wiki/display/AST/Speech+Recognition+API
> doesn't actually explain how to integrate the actual speech engines.
> In this previous forum post,
> https://community.asterisk.org/t/asterisk-15-jack-
> streams-speech-recognition-so-many-questions/72108/2
> , jcolp explained that most people don't use the speech interface
> anyway, because
> "Asterisk modules are written in C, and it’s more difficult to do
> things in that fashion. Using the Record and ship it off using Python,
> etc, is just easier and gets the job done for a lot of people to where
> they find it acceptable.
> So, AGI it is! But I'm still stuck on how I record for speech AND get
> a DTMF if it was dialled.
> Regarding speech in general, even "Asterisk - The Definitive Guide" just
> says:
> "Asterisk does not have speech recognition built in, but there are
> many third-party speech
> recognition packages that integrate with Asterisk. Much of that is
> outside of the scope
> of this book, as those applications are external to Asterisk" - helpful!
> The speech-rec mailing list at
> http://lists.digium.com/pipermail/asterisk-speech-rec/ hasn't been
> posted to since 2013
> Someone else asked about speech recognition and unimrcp in this post:
> http://lists.digium.com/pipermail/asterisk-users/2017-February/290875.html
> uniMCRP https://mojolingo.com/blog/2015/speech-rec-asterisk-get-started/
> http://www.unimrcp.org/manuals/html/AsteriskManual.html#_Toc424230605
> This has a Google Speech Recogniser plugin, but it's $50 per channel
> http://www.unimrcp.org/gsr
> *Reasons to use Lex over Google TTS*
> • Has just been released in eu-west-1:
> https://forums.aws.amazon.com/ann.jspa?annID=5186
> • Supports 8KHz telepony https://forums.aws.amazon.com/ann.jspa?annID=4775
> • Is in the core AWS SDK
> http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/LexRuntime.html
> • Has a number slot type:
> http://docs.aws.amazon.com/lex/latest/dg/built-in-slot-number.html
>  - this means no accidental recognition of "won", "one" or "juan" instead
> of 1!
> The pricing is definitely right: "The cost for 1,000 speech requests
> would be $4.00, and 1,000 text requests would cost $0.75. From the
> date you get started with Amazon Lex, you can process up to 10,000
> text requests and 5,000 speech requests per month for free for the
> first year".
> Amazon Transcribe looks promising too, but is only available for
> developer invitation at this time:
> https://aws.amazon.com/transcribe/ https://aws.amazon.com/
> transcribe/pricing/
> But all I need now is the quickest, simplest way to send Lex a short
> 8KHz file and get a single digit back, as quickly and reliably as
> possible.
> Before I travel too far down this road, can someone point me in the
> right direction and possibly steer me away from the wrong path?!
> --
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