## Prerequisites

- Activate voice call:
  - For SaaS installations, contact the support team to activate the feature.
  - For on-premises installations, activate the feature by adding `FEATURE_ENABLE_VOICECALL_WHITELIST` in `values.yaml` and assigning the corresponding organization IDs. For example, `FEATURE_ENABLE_VOICECALL_WHITELIST:<organization-1-id>,<organization-2-id>`. For all organizations, use `*`.
- Configure a voice provider in the Project’s [Voice Preview Settings](https://docs.cognigy.com/ai/agents/test/voice-preview#set-up-a-speech-provider) and the AI Agent’s [voice and language](https://docs.cognigy.com/ai/agents/test/interaction-panel/overview).
- Allow microphone access in your browser, and then in your device settings if needed.

## How to Use Voice Call Mode

To start a test call with the AI Agent, click the  tab in the Interaction Panel and click  at the bottom. To end the call, click .

During a call, you can:

- **Monitor the call duration**. The timer displayed next to the  button shows how long the call has been active.
- **Send DTMF tones**. Click  to open a dialpad and send touch-tone (DTMF) signals during the call. With the dialpad, you can enter codes or navigate menus during a call.
- **Follow the conversation**. View the real-time conversation transcript in the Interaction Panel to track the call.

Voice call mode has a timeout. If you don’t provide any voice input for a period, the call ends automatically to prevent unnecessary connection time. To view and analyze the payload of a voice input, click  indicated in the message fields.

## More Information

- [Voice Gateway Nodes](https://docs.cognigy.com/ai/agents/develop/node-reference/voice/voice-gateway/overview)
- [Voice Preview](https://docs.cognigy.com/ai/agents/test/voice-preview)
- [Voice Gateway](https://docs.cognigy.com/voice-gateway/overview)