# Voice Chat The BlueFletch Chat application integrates with the Twilio API to enable users to have audio and video calls with each other. Users can initiate and accept calls through BlueFletch Chat, with the call type (audio or video) determined by the selected option in the app. ### Audio Call **Buttons:** Users can answer or end a call, mute or unmute the microphone, or switch to speakerphone mode. **TextViews:** This provides visual information or prompts, such as displaying the caller's name or indicating call status. **Select Speaker Dialog:** This allows users to choose the audio output device (the earpiece speaker or the device's external speaker). ### Video Call **Buttons:** Users can initiate or end a video call, toggle the camera on or off, mute or unmute the microphone, or switch between front and rear cameras. **TextViews:** This provides visual information or prompts, such as displaying the caller's name or indicating call status. **Select Speaker Dialog:** This allows users to choose the audio output device (the earpiece speaker or the device's external speaker). --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.bluefletch.com/bluefletch-enterprise/product-guides/device-applications/voice-chat.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.