Why does Hemu smart camera have no sound during voice intercom?

First of all, please check whether the "Camera Microphone" option is turned on in the camera settings. If this option is turned off, the sound will not be heard on the mobile phone. If the camera settings are normal, it may be that the phone's microphone or speaker management permissions have been set for Hemu App on the phone. The setting method for iPhone is as follows: open settings, find Hemu, and turn on the microphone and notification permissions inside. Android phones are similar. , find the permission management settings on your phone, such as "Application Management", "Phone Manager", and "Security Center", and turn on the permissions for the microphone and speaker.