Dynamically configuring the Text to Speech service

Example: Setting the Text to Speech voice (en-US_LisaVoice)

In this example, the voice is set to en-US_LisaVoice. Because the credentials property isn't defined, the Media Relay will use the credentials defined through the Media Relay configuration (WATSON_TTS_URL, WATSON_TTS_USERNAME, and WATSON_TTS_PASSWORD)

{
  "output": {
    "vgwAction": {
      "command": "vgwActSetTTSConfig",
      "parameters": {
        "config": {
  				"voice": "en-US_LisaVoice"
  			}
  		}
    }
  }
}

Using updateMethod

You can use the updateMethod property in dynamic configuration to define how changes to the configuration are made, by either replacing the configuration or merging new configuration properties, and specifying whether these changes occur for the duration of the call or one conversation turn.

Deprecated: Configuring the Text to Speech service by defining state variables

In Version 1.0.0.2, configuring Watson speech service by defining state variables was deprecated in favor of the action tags described in the previous sections.

Important: Although the state variables continue to function, you can't define these deprecated state variables and the action tags within a node. Your Watson Assistant dialog can contain a mixture of action tags and deprecated state variables, but the JSON definition for each node can contain only one or the other.

{
	"context": {
		"vgwTTSConfigSettings":{
			"credentials": {
		  	"url": "url": "https://api.us-south.text-to-speech.watson.cloud.ibm.com/instances/{instance_id}",
		  	"apikey": "{apikey}",
		  	"tokenServiceProviderUrl": "https://iam.cloud.ibm.com/identity/token"
			},
			"config": {
				"x-watson-learning-opt-out": true,
				"voice": "es-ES_LauraVoice"
			},
			"jitterBufferDelay": 200,
			"cacheTimeToLive": 336
		}
	}
}