Can anyone help me with the following query?

SELECT
  voc.username AS Medewerker,
  voc.bestvastonbep_count AS Doorgezet,
  IFNULL(cc.call_count, 0) AS Telefoongesprekken,
  voc.bestvastonbep_count / IFNULL(cc.call_count, 0) AS Ratio
FROM (
  SELECT
    u.id AS user_id,
    CONCAT(u.firstname, ' ', u.lastname) AS username,
    COUNT(vo.id) AS bestvastonbep_count
  FROM `bestvastonbep`       vo
  JOIN `best`                b   ON b.id = vo.best_id
  JOIN `vastonbepbeststatus` vos ON b.id = vos.best_id
  JOIN `user`                u   ON u.id = b.user_id
  WHERE vos.type = 2
  AND   vos.status = 2
  AND  (b.date BETWEEN '2017-02-04' AND '2017-05-04')
  GROUP BY u.id
) voc
LEFT JOIN (
  SELECT
    user_id,
    COUNT(id) AS call_count
  FROM `call` c
  WHERE  (c.start BETWEEN '2017-02-04' AND '2017-05-04')
  AND c.duration > 0
  AND c.calltype = 'out'
  GROUP BY c.user_id
) cc
ON voc.user_id = cc.user_id;

It produces the desired result, but it's immensely slow.
I've read questions from other people about similar queries. For them it turned out that joining subqueries wasn't necessary. The difference for me is that I'm using GROUP for both subqueries. Hopefully there's a way and I'm just not seeing it.

Edit in response to RDFozz

The EXPLAIN query gives the following result.

The first subquery is very fast. (0.1 s)
The second subquery takes about 6 seconds.
The complete query takes about 57 seconds.

There is an index on call.user_id as well as call.start.
But the call table currently has about 32 million rows.

Answer I took Plan A as described by Rick James. The query now looks like the following:

SELECT
    voc.username AS Medewerker,
    voc.bestvastonbep_count AS Doorgezet,
    IFNULL(count(c.user_id), 0) AS Telefoongesprekken,
    IFNULL(voc.bestvastonbep_count / count(c.user_id), "∞") AS Ratio
FROM (
    SELECT u.id AS user_id, CONCAT(u.firstname, ' ', u.lastname) as username, COUNT(vo.id) AS bestvastonbep_count
    FROM `bestvastonbep`       vo
    JOIN `best`                b   ON b.id = vo.best_id
    JOIN `vastonbepbeststatus` vos ON b.id = vos.best_id
    JOIN `user`                u   ON u.id = b.user_id
    WHERE vos.type = 2
    AND   vos.status = 2
    AND  (b.date BETWEEN '2017-02-04' AND '2017-05-04')
    GROUP BY u.id
) voc 
LEFT JOIN `call` c on
    (c.start BETWEEN '2017-02-04' AND '2017-05-04')
    AND c.duration > 0
    AND c.calltype = 'out'
    AND voc.user_id = c.user_id
GROUP BY voc.user_id;

It takes about 7 seconds, depending on the size. Faster would be nice, but this is just about acceptable for my purposes.