Viewing and adjusting a participant's audio levels

Go to Conferences.
Click a Conference name and then click on a participant's name.
Click the Audio tab.

Waveforms and statistics

The Participant audio and Conference audio waveforms give a visual indicator of the current audio levels from the participant and from the conference. If the participant is the active speaker at the time when you click the audio tab, the waveforms should be similar. If a waveform is flat, it means the source is silent or muted.
AGC (Adaptive Gain Control): indicates the status of AGC for this endpoint. AGC can be set by the conference, or by the participant's configuration, or manually on this page. The manual setting for an active participant - on this page - always takes precedence over conference or participant configuration.
Current voice gain applied: indicates how much amplification is applied to the voice signal at the time you access the page; the gain could have been applied manually or by AGC.
Audio energy (post gain stage): is the average of the whole audio signal, including manual or AGC gain, from this participant over time, compared with the maximum that the MCU can tolerate. The number is always negative as it represented by a fraction of the maximum using a logarithmic scale. A mostly quiet signal will have larger negative numbers, while a very loud participant will be closer to 0.
Average voice level (pre gain stage): is an average of the audio signal's high points over time, measured against the maximum that the MCU can tolerate. The average voice level is useful when compared to the average background level; a large difference between the two means the voice is easily discernible from the background noise. If it is too close to the average background level, the audio may be improved by applying AGC or manual gain.
Average background level (pre gain stage): is an average of the signal's low points over time, measured against the maximum that the MCU can accept. It is always negative and a larger negative number means a lower background noise. If the average background level is too high, the conference may experience undesirable effects such as switching to this participant when the participant is not the active speaker.

Applying gain and muting audio

Use the controls described in the following table to adjust the active participant's audio levels, then click Update to apply your changes.

Field	Field description	Usage tips
Gain control	You can apply one of the following four gain control options by selecting the associated radio button: Use conference configuration: the participant inherits the conference's AGC setting. Disable AGC: do not apply AGC to the audio from this participant. Enable AGC: apply AGC to the audio from this participant. Apply fixed gain: enter a dB value by which to adjust the participant's audio gain; a positive gain amplifies, and a negative gain attenuates, the participant audio. 1dB is approximately 60% change, 3dB is approximately 100% change and 5dB is approximately 300% change. For example, if the participant sounds twice as loud as everyone else, apply -3dB gain.	The selected gain control option is effective immediately, and persists until the participant leaves or the conference ends. If you need to set AGC in advance, you can do so on a per conference or per participant basis. You can apply AGC when inviting ad hoc participants or when preconfiguring endpoints. The gain control setting on this page - the active participant's audio page - takes precedence over any other gain control setting, whether that was preconfigured on the endpoint, the conference, or the template.
Mute in-band DTMF	This control determines whether the DTMF tones from this participant are audible to the conference. You can select one of the following: <use conference configuration>: DTMF from the active participant is either muted or audible to the conference, depending on the conference configuration. Disabled: DTMF from this participant is audible to the MCU and is transmitted on to the other participants. Enabled: DTMF from this participant is audible to the MCU but is not transmitted on to other participants.
	Prevents others from hearing this participant (like mic. mute).
	Allows others to hear this participant (stop muting participant).
	Prevents this participant from hearing the conference (like speaker mute). Note: The endpoint may not always detect DTMF tones from the MCU after you mute the audio from the MCU.
	Allows this participant to hear the conference (stop muting conference).