1. First adjust the volume of the microphone and speaker. Go to Settings > Device Settings > Device volume.
2. If there is still an echo in the intercom after adjusting it to the appropriate volume. It may be caused by the presence of echoes in the narrow indoor environment where people and equipment are in; It is recommended to retest it by placing the phone at a distance of 5 meters from the camera, or to install the camera in a relatively open outdoor environment.
3. If the camera is located in a relatively open environment with no environmental echoes, and the phone is far enough away from the camera, there are still echoes on the App. This may be due to the temporary instability of the mobile network or camera network, resulting in untimely sound cancellation processing. We suggest that you switch the mobile network to test again or test in another time.