Формат таблицы cdr в базе данных конференций

mysql> describe cdr;
+------------+------------------+------+-----+---------------------+----------------+
| Field      | Type             | Null | Key | Default             | Extra          |
+------------+------------------+------+-----+---------------------+----------------+
| id         | int(10) unsigned | NO   | PRI | NULL                | auto_increment |
| has_record | tinyint(1)       | YES  |     | 0                   |                |
| starttime  | timestamp        | NO   |     | 0000-00-00 00:00:00 |                |
| endtime    | timestamp        | NO   |     | CURRENT_TIMESTAMP   |                |
| xml        | text             | NO   |     | NULL                |                |
| conference | varchar(255)     | NO   |     |                     |                |
+------------+------------------+------+-----+---------------------+----------------+
6 rows in set (0.00 sec)