MySQL, reading this EXPLAIN statement

SELECT s.`session_id` id,
                  DATE_FORMAT(s.`created`,'%m/%d/%Y') date,
                  u.`name`,
                  COUNT(DISTINCT c.id) calls,
                  COUNT(DISTINCT h.id) emails,
                  SEC_TO_TIME(MAX(DISTINCT c.duration)) duration,
                  (COUNT(DISTINCT em.email_id) + COUNT(DISTINCT pho.phone_id) > 0) status
           FROM `fa_sessions` s
           LEFT JOIN `fa_users` u ON s.`user_id`=u.`user_id`
           LEFT JOIN `fa_email_aliases` a ON a.session_id = s.session_id
           LEFT JOIN `fa_email_headers` h ON h.email_id = a.email_id
           LEFT JOIN `fa_phones` ph ON ph.session_id = s.session_id
           LEFT JOIN `fa_email_aliases` em ON em.session_id = s.session_id AND em.status = 1
           LEFT JOIN `fa_phones` pho ON pho.session_id = s.session_id AND pho.status = 1
           LEFT JOIN `cdr` c ON c.userfield = ph.phone_id
           WHERE s.`partner_id`=1
           GROUP BY s.`session_id`

SELECT s.`session_id` id,
                  DATE_FORMAT(s.`created`,'%m/%d/%Y') date,
                  u.`name`,
                  COUNT(DISTINCT c.id) calls,
                  COUNT(DISTINCT h.id) emails,
                  SEC_TO_TIME(MAX(DISTINCT c.duration)) duration,
                  (COUNT(DISTINCT em.email_id) + COUNT(DISTINCT pho.phone_id) > 0) status
           FROM `fa_sessions` s
           LEFT JOIN `fa_users` u ON s.`user_id`=u.`user_id`
           LEFT JOIN `fa_email_aliases` a ON a.session_id = s.session_id
           LEFT JOIN `fa_email_headers` h ON h.email_id = a.email_id
           LEFT JOIN `fa_phones` ph ON ph.session_id = s.session_id
           LEFT JOIN `fa_email_aliases` em ON em.session_id = s.session_id AND em.status = 1
           LEFT JOIN `fa_phones` pho ON pho.session_id = s.session_id AND pho.status = 1
           LEFT JOIN `cdr` c ON c.userfield = ph.phone_id
           WHERE s.`partner_id`=1
           GROUP BY s.`session_id`

fa_sessions ( partner_id, session_id )
fa_users ( user_id )
fa_email_aliases ( session_id, email_id )
fa_email_headers ( email_id )
fa_email_aliases ( session_id, status )
fa_phones ( session_id, status, phone_id )
cdr ( userfield )