Vosk speech recognition modules for Asterisk

This is an asterisk module for Vosk API server:

https://github.com/alphacep/vosk-server

It is tested with latest asterisk git master, but should probably work for earlier versions.

Installation

1. First build the modules

./configure --with-asterisk=<path_to_source>/asterisk --prefix=<path_to_install>
make
make install

2. Edit modules.conf to load modules

load = res_speech.so
load = res_speech_vosk.so
load = res_http_websocket_fix.so

disable original res_http_websocket since it contains bugs

; load = res_http_websocket.so

3. Edit dialplan in extensions.conf:

[internal]
exten = 1,1,Answer
same = n,Wait(1)
same = n,SpeechCreate
same = n,Set(SPEECH_ENGINE(language)=${CHANNEL(language)})
same = n,SpeechBackground(hello)
same = n,Verbose(0,Result was ${SPEECH_TEXT(0)})

4. Run docker

docker run -d -p 2700:2700 alphacep/kaldi-en:latest

5. Dial extension and check the result