[asterisk-dev] Text-to-Speech and Speech-to-Text

sduthil at wazo.io sduthil at wazo.io
Mon Mar 29 16:39:59 CDT 2021

On 3/22/21 3:14 PM, Ben Ford wrote:
> More information on the protocol used for this and the overall 
> project can be found here:
> https://wiki.asterisk.org/wiki/pages/viewpage.action?pageId=45482453
> After reading the wiki page, if there is anything you feel could be 
> improved, we’d love to hear about it.

Thank you Ben.

One thing that I would like to see: more attributes on error responses, 
mainly an error code that can be interpreted by the dialplan in order to 
react differently, depending of the error type. For example, I want to 
distinguish when the application received no sound (e.g. because of a 
microphone issue) I want the user to know that and try again vs the 
application is misconfigured and I just want to stop.

Using only one "error_msg" attribute for that is not ideal, since the 
calling dialplan has to parse the error_msg and react accordingly. 
Having a separate error code allows the dialplan to choose the 
appropriate behavior easily, while still having the error_msg for 
logging/displaying/debugging purposes.

I see two choices for this improvement:

- add an "error_code" (or similar) in the error response

     "version": "1.0",
     "response": "error",
     "error_msg": "Could not connect to Google (server down).",
     "error_code": "10001"  // or any other string from the application

- allow external applications to add arbitrary attributes into a 
"error_details" attribute

     "version": "1.0",
     "response": "error",
     "error_msg": "Could not connect to Google (server down).",
     "error_details": {
         "error_code": "10001",
         "error_user_language": "fr_CA"
         "error_user_display": "La connexion au serveur Google a échoué"

My preference goes to the "error_details" as it is more flexible, but I 
don't know how complex it is to implement.

PS: I am not currently a user of TTS/STT, I don't have a real use-case 
needing this.

Sébastien Duthil
Wazo developer

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