Why Am I Charged Even When There Is Only One Person in the Room and There Is No Audio/video Call?

SparkRTC billing is based on how long each user of a room watches the video streams of other uses. The billing can also vary with resolution levels. If there is only one person in a room, SparkRTC cloud resources are used even if no stream is pushed (no uplink data is generated). When there is only one person in a room, the person cannot subscribe to the audio/video streams of others and cannot see the video image. The service usage is calculated based on the voice duration.