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Intermediate · 15 minutes · Voice
In this tutorial, you customize Nelly, a voice agent for the fictional company Nice Express. You change what Nelly says when it picks up a call. You also set up barge-in. Barge-in happens when a caller interrupts the agent while the agent speaks. In the voice studio, the Interruptions setting controls barge-in. Nice Express callers often read out tracking numbers and say short sounds such as “uh-huh”. Nelly keeps talking when a caller says a short sound. You make both changes in the voice studio. The voice studio stores an agent’s voice settings in one place. The Voice endpoint doesn’t have its own greeting setting. A Voice endpoint that targets an agent inherits the agent’s speech settings.

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Prerequisites

Complete the following prerequisites:
  • A voice agent named Nelly with text-to-speech and speech-to-text providers. To create a voice agent, follow Getting started with voice agents and name the agent Nelly.
  • Speech to speech turned off for the agent. With speech to speech on, the Voice studio card isn’t available.
  • A Voice endpoint that targets the agent.
  • A browser with microphone access allowed. The test call uses your microphone.

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Steps

1

Find where the voice endpoint gets its speech settings

  1. In the navigation menu of the project, go to Deploy > Endpoints and open the Voice endpoint that targets Nelly.
  2. On the Setup tab, find the Speech card. The Set on the agent badge means that the agent defines the speech settings.
  3. Click Edit speech on Nelly. The agent opens.
Changes that you make to the agent apply to calls on the endpoint.
2

Open the voice studio

  1. On the Configuration tab of the agent, find the Voice section on the right side of the page.
  2. Click Voice studio. The voice studio opens in a full-page view.
3

Change the greeting

  1. Scroll to the Greeting section. This section describes what the agent says when it answers the call.
  2. Select User defined. With Agent decides, the agent creates its own greeting.
  3. In the Greeting text field, enter the following text:
  4. To hear the greeting, click the play button next to the field.
The Greeting section of the voice studio with User defined selected and the greeting text.
Keep the greeting to one or two short sentences. Callers hear the greeting; they don’t read it.
4

Set up barge-in

  1. Scroll to the Turn taking section.
  2. From the Interruptions list, select Deliberate.
The Interruptions list has the following options:
The Interruptions list in the voice studio with the options Natural, Deliberate, and Never.
5

Save your changes

  1. In the upper-right corner of the voice studio, click Save. The voice studio closes.
  2. On the Configuration tab, click Save changes.
6

Test the changes with a voice call

  1. In the upper-right corner, click the chat icon to open the interaction panel.
  2. At the top of the panel, select Voice.
  3. Click Start a call. If your browser asks for microphone access, allow it.
  4. Listen to the greeting. Nelly says the text that you entered.
  5. While Nelly speaks, say “uh-huh”. The short sound doesn’t interrupt Nelly.
  6. While Nelly speaks, say a full sentence. Nelly stops and answers.
  7. End the call in the interaction panel.

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What you built

You changed Nelly’s greeting in the voice studio and set up barge-in so that only deliberate interruptions stop Nelly. You also saw that the Voice endpoint takes the agent’s speech settings. You tested the result with a voice call.

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What’s next

Last modified on November 11, 2026