CCrmDocumentContact::getDocumentName

static function getDocumentName($documentId)
{
	$arDocumentID = self::GetDocumentInfo($documentId);
	$caption = '';

	$dbRes = CCrmContact::GetListEx(array(), array('=ID' => $arDocumentID['ID'], 'CHECK_PERMISSIONS' => 'N'),
		false, false,
		['HONORIFIC', 'NAME', 'SECOND_NAME', 'LAST_NAME']
	);
	$arRes = $dbRes ? $dbRes->Fetch() : null;

	if($arRes)
	{
		$caption = CCrmContact::PrepareFormattedName([
			'HONORIFIC' => isset($arRes['HONORIFIC']) ? $arRes['HONORIFIC'] : '',
			'NAME' => isset($arRes['NAME']) ? $arRes['NAME'] : '',
			'SECOND_NAME' => isset($arRes['SECOND_NAME']) ? $arRes['SECOND_NAME'] : '',
			'LAST_NAME' => isset($arRes['LAST_NAME']) ? $arRes['LAST_NAME'] : ''
		]);
	}

	return $caption;
}