Subscribe to real-time DTMF events
This code snippet registers a listener to receive asynchronous DTMF inputs from a call.
This is only applicable to Input NCCO events with the mode set to asynchronous.
Example
Replace the following variables in the example code:
| Key | Description |
|---|---|
VOICE_CALL_ID | The UUID of the call leg. |
VOICE_EVENT_URL | The URL (wrapped in an array) to send DTMF events to, as a POST request. |
Prerequisites
Execute the following command at your terminal prompt to create the JWT for authentication:
export JWT=$(nexmo jwt:generate $PATH_TO_PRIVATE_KEY application_id=$NEXMO_APPLICATION_ID)Write the code
Add the following to subscribe-dtmf-real-time-events.sh:
curl -X PUT https://api.nexmo.com/v1/calls/$VOICE_CALL_ID/input/dtmf \
-H "Authorization: Bearer $JWT"\
-H "Content-Type: application/json"\
-d '{"event_url": "'"VOICE_EVENT_URL"'"}'Run your code
Save this file to your machine and run it:
Prerequisites
Add the following to build.gradle:
Create a file named SubscribeToDtmfEvents and add the following code to the main method:
Write the code
Add the following to the main method of the SubscribeToDtmfEvents file:
Run your code
We can use the application plugin for Gradle to simplify the running of our application. Update your build.gradle with the following:
Run the following gradle command to execute your application, replacing com.vonage.quickstart.voice with the package containing SubscribeToDtmfEvents:
Prerequisites
Install-Package Vonage