1. Please check whether the protective film at the camera speaker is torn off;
2. Whether the mobile phone terminal is enabled to allow the APP to call the mobile phone microphone;
3. Whether the microphone function of the APP video interface is turned on;
4. Whether the ringtone of the mobile phone is turned on, and whether the volume of the ringtone is too low.
If you still have questions, please contact customer support for further assistance.