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kazoo Speech#

This core library governs integrations with Text-to-Speech (TTS) providers and with (Automatic Speech Recognition (ASR) engines)[] to allow Kazoo callflows to take advantage of the advanced functionality these provide.


Kazoo, by default, will use the internal mod_flite to play the text from a TTS callflow action.

There are also modules for iSpeech and VoiceFabric.


Kazoo currently supports as an ASR engine:

  1. iSpeech
  2. Google Cloud Speech API

Service Plan Definitions#

  1. The ASR block defines usage rates for the providers
  2. The transcription block defines rates for having transcribe enabled on a vmbox
    "asr": {
           "google": {
               "rate": 1,
               "name": "Google ASR"
           "ispeech": {
               "rate": 1,
               "name": "ispeech ASR"
       "plan": {
           "voicemails": {
               "mailbox": {
                   "name": "Voicemail Box",
                   "rate": 1.99,
                   "cascade": true
               "transcription": {
                   "cascade": true,
                   "rate": 1,
                   "name": "VMBox Transcription MRC"