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Getting Started with Voice Notifications

You can send an audio notification to the user using Voice Calls. Plivo’s PHLO allows you to quickly create and configure a voice alert system for your business. An API call from your application will trigger the PHLO and will enable making direct calls to the customers with critical alerts.

Use Case Outline

Creating the Use Case using PHLO

With PHLO, you can quickly create a workflow that suits your use case. Make sure you are registered and logged in on Plivo Console to proceed.

Use the following components to create this PHLO:

  • Initiate Call
  • Play Audio

When the application send an API request to the PHLO, it triggers a call to the user’s phone number using the Initiate Call component. Once the user answers the call, the Play Audio component plays an audio to the user. The call will disconnect automatically after the playback audio is completed.

Note: The Callback function provides the user details required to make the call.

To create this PHLO

  1. On the top navigation bar, click PHLO. The PHLO page will appear and display your existing PHLOs, if any. If this is your first PHLO, then the PHLO page will be empty. image alt text
  2. Click CREATE NEW PHLO to build a new PHLO. image alt text
  3. On the Choose your use-case window, click Build my own. The PHLO canvas will appear with the Start node. Note: The Start node is the starting point of any PHLO. You can choose between the four available trigger states of the Start node; Incoming SMS, Incoming Call, Endpoint Call, and API Request. For this PHLO, we will use the API Request trigger state.
  4. Click the Start node to open the Configurations tab.
  5. Then, enter the information to retrieve from the HTTP Request payload. For example, this could be a variable for the list of numbers to call. image alt text
  6. From the list of components, on the left hand side, drag and drop the Initiate Call component onto the canvas. This will add a Initiate call node onto the canvas. image alt text
  7. Connect the Start node with the Initiate Call node, using the API Request trigger state. image alt text
  8. Next, to configure the From and To numbers in the Initiate Call node, use the variables set in the Start node. Note:
    • Enter two curly brackets to view all available variables.
    • The values for the From and To numbers are picked from the HTTP Request Payload. Make sure to clearly define the variables in the Start node. image alt text
  9. Similarly, create a node for the Play Audio component and connect it to the Initiate Call node using the Answered trigger state. image alt text
  10. Next, configure the Play Audio node to play a specific message to the user. Note: The audio playback can either be static or dynamic. In this example, we will use a combination of a static message along with some dynamic message.
  11. On the Play Audio Configurations tab, enter a static message (For example, Your Flight status is:) in the Speak Text field, followed by a variable to include the dynamic text. Note:
    • You can choose a variable by entering two curly brackets in the Speak Text field.
    • Make sure you validate the configuration for each node. image alt text
  12. After you complete the configurations, click Save. You can trigger your PHLO using the PHLO URL to test it out. Your complete PHLO will look like this:

For more information on using PHLO, see the PHLO User Guide. For more information on components and their variables, see the PHLO Components Library.

Uses of this PHLO

You can also use this PHLO structure for other use cases, like:

  • Order notification
  • Booking status
  • Delivery status
  • Flight cancellation/reschedule
  • Two-Factor Authentication/One-Time Password
  • New Offer notification
  • Account balance notification