Conversation

• Watson (V1)

• Dialogflow ES (V1 in v6.4 and earlier, V2 in 7.4 and later)

• Microsoft Azure Bot Service

• Custom (via Orchestration server)

Voice / Text to Speech / TTS

• SM Internal / Voice Packages

• Google

• Microsoft

• AWS Polly

• SoundHound 

• No support for custom TTS

Internal Voice Options

• Wave Folder (not part of public API)

Speech Recognition / Speech to Text / STT

• IBM Watson

• Microsoft

• Google

• In development: AWS Transcribe

• No support for custom STT

Internal Speech Recognition Options

• Local SM Speech Recognizer (not part of public API)

• Deep Speech Recognizer (not part of the public API)

• Local Secondary SM Speech Recognizer (not part of the public API)