CrmManager::getActivityViewUrl

public function getActivityViewUrl($activityId)
{
	$activityPath = CComponentEngine::makeComponentPath(
		'bitrix:crm.activity.planner'
	);
	$activityPath = getLocalPath('components' . $activityPath . '/slider.php');
	if($activityPath)
	{
		$uriView = new BitrixMainWebUri('/bitrix/components/bitrix/crm.activity.planner/slider.php');
		$uriView->addParams(array(
			'site_id' => SITE_ID,
			'sessid' => bitrix_sessid_get(),
			'ajax_action' => 'ACTIVITY_VIEW',
			'activity_id' => $activityId,
		));

		return $uriView->getLocator();
	}

	return false;
}