| -------------------------------- | ------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |

| noSpeakerDevicesAvailable | there's no audio output device (speaker) on the user's system. | - Set to `True` when there are no speaker devices on the system, and speaker selection is supported. <br/> - Set to `False` when there's a least one speaker device on the system, and speaker selection is supported. | All speakers are unplugged | When value set to `True`, consider giving visual notification to end user that their current call session doesn't have any speakers available. |

| speakingWhileMicrophoneIsMuted | Speaking while being on mute. | - Set to `True` when local microphone is muted and the local user is speaking. <br/> - Set to `False` when local user either stops speaking, or unmutes the microphone. <br/> - This diagnostic event can be automatically disabled if it is triggered for a certain amount of times without any user action to avoid noise and provide a better user experience. It will be re-enabled again when a new mute action occurs. | During a call, mute your microphone and speak into it. | When value set to `True` consider giving visual notification to end user that they might be talking and not realizing that their audio is muted. |

| microphoneNotFunctioning | Microphone isn't functioning. | - Set to `True` when we fail to start sending local audio stream because the microphone device may have been disabled in the system or it's being used by another process. This UFD takes about 10 seconds to get raised. <br/> - Set to `False` when microphone starts to successfully send audio stream again. | No microphones available, microphone access disabled in a system | When value set to `True` give visual notification to end user that there's a problem with their microphone. |

| microphoneMuteUnexpectedly | Microphone is muted | - Set to `True` when microphone enters muted state unexpectedly. <br/> - Set to `False` when microphone starts to successfully send audio stream | Microphone is muted from the system. Most cases happen when user is on an Azure Communication Services call on a mobile device and a phone call comes in. In most cases, the operating system mutes the Azure Communication Services call so a user can answer the phone call. | When value is set to `True`, give visual notification to end user that their call was muted because a phone call came in. For more information, see how to best handle [OS muting an Azure Communication Services call](../../best-practices.md#handle-the-os-muting-a-call-when-a-phone-call-comes-in) section for more details. |

| microphonePermissionDenied | there's low volume from device or it's almost silent on macOS. | - Set to `True` when audio permission is denied from the system settings (audio). <br/> - Set to `False` on successful stream acquisition. <br/> Note: This diagnostic only works on macOS. | Microphone permissions are disabled in the Settings. | When value is set to `True`, give visual notification to end user that they didn't enable permission to use microphone for an Azure Communication Services call. |