Call::getAdditionalIconButton

public function getAdditionalIconButton(): ?IconButton
{
	$callInfo = $this->fetchInfo();
	if ($this->isTranscripted($callInfo))
	{
		return (new IconButton('script', Loc::getMessage('CRM_TIMELINE_BUTTON_TIP_TRANSCRIPT')))
			->setScopeWeb()
			->setAction((new JsEvent('Call:OpenTranscript'))
				->addActionParamString('callId', $callInfo['CALL_ID']))
		;
	}

	return null;
}