Changes volume level of a participant of an active group call. If the current user can manage the group call, then the
participant's volume level will be changed for all users with the default volume level.
Request type for Tdjson#setGroupCallParticipantVolumeLevel.
Changes volume level of a participant of an active group call. If the current user can manage the group call, then the participant's volume level will be changed for all users with the default volume level. Request type for Tdjson#setGroupCallParticipantVolumeLevel.