have a look at this post, I believe that it answers your questions.
http://forums.noojee.com.au/index.php/topic,583.0.htmlBy the way we don't recommend using asterisk 1.6.2 its still rather green.
Unless you are just testing or know exactly what you are doing I would stick with 1.6.0 or 1.6.1 if you have to.
The rule of thumb with asterisk is you don't install a version into production until it hits 10. e.g. 1.6.0.10 or 1.6.1.10.
By this measure 1.6.2.2 is only 2. Don't do it to yourself

Regards,
Brett