How to remove_filter that filters iframes in posts?

Which filter if removed allows iframes to be inserted into wordpress posts?

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  1. This filter does not. This feature is disabled in the visual editor TinyMCE.

    function wpse49619_change_mce_options($initArray) {
        $ext = 'iframe[align|longdesc|name|width|height|frameborder|scrolling|marginheight|marginwidth|src]';
        if ( isset( $initArray['extended_valid_elements'] ) ) {
            $initArray['extended_valid_elements'] .= ',' . $ext;
        } else {
            $initArray['extended_valid_elements'] = $ext;
        }
        // maybe; set tiny paramter verify_html
        //$initArray['verify_html'] = false;
        return $initArray;
    }
    add_filter('tiny_mce_before_init', 'wpse49619_change_mce_options');
    

    Also you can use examples from WPEngineer how to enhancement TinyMCE.