iSee uses the current output device selected on your operating system. Ensure that this selected output device is correct. You can select your output device in the following locations:    Windows:  Settings > System > Sound.     Mac OS:  System Preferences > Sound.Here you can select the appropriate output device. There are also tools to test the audio device here. Ensure the output device is working properly outside of iSee first. If your device isn’t working, the device may have a separate mute button on it. If it is still not working you may need to contact your organization’s support team.If your device is working outside of iSee, you can test your device in iSee by going to Settings > Audio and pressing the “Test Speakers” button which plays a doorbell sound. If you still can’t hear the doorbell, or can hear the doorbell but not other users, you may need to contact your organisation’s support team or our support team at support@iseevc.com.