DmitriyMarinin

$listActivity = CCrmActivity::GetList(
    $arOrder = [],
    $arFilter = [
        'OWNER_ID' => $dealId, // ID сделки
        'OWNER_TYPE_ID' => 2, // 1-Лид, 2-Сделка, 3-Контакт, 4-Компания
        'TYPE_ID' => 3, // 1-Встреча, 2-Звонок, 3-Задача, 4-Email
        'COMPLETED' => 'N'
    ],
    $arGroupBy = false,
    $arNavStartParams = false,
    $arSelectFields = [],
    $arOptions = [
        'CURRENT_USER' => 1
    ]
);

while ($activity = $listActivity->Fetch()) {
    $arActivity[] = $activity;
}