Voice-Only

You can set up a voice-only session when instantiating a Publisher object.

There are a number of user interface optimizations that you can make in a voice-only session:

• Getting audio levels — The Vonage Video client libraries include events that report the audio level of a subscriber or publisher. For more information, see this topic.

• Speaker detection — You can use the audio level events to detect active speakers in a session. For an example using OpenTok.js, see this topic.
• Displaying a custom volume indicator — You can use the audio level events to display a volume indicator (such as a meter). For an example using OpenTok.js, see this topic.
• Setting an image to display in audio-only mode — You can display an image in a Publisher or Subscriber that is in audio-only mode. In OpenTok.js, see this topic. In iOS and Android, you can add an image to the view hierarchy of the app.

When archiving a voice-only session, you can specify that the archive include audio only (not video) when you create the archive. See the archiving developer guide.