code: public void dndOff() throws WorkspaceApiException {
          try {
              ApiSuccessResponse response = this.voiceApi.setDNDOff(null);
              throwIfNotOk("dndOff", response);
          } catch (ApiException e) {
              throw new WorkspaceApiException("dndOff failed.", e);
          }
      }
docs: Turn off Do Not Disturb for the current agent on the voice channel.