[asterisk-users] Call Back on Busy

[Ron]

Hi All,

One of our user asked the question, when she tries to call another local 
extension but the other end is engaged she will keep on trying until she 
finally can get thru. So she asked would it be possible to request for 
an auto-callback from the user she's trying to call to once it's not 
engaged anymore. is this possible on asterisk? what is that feature 
called? i am using asterisk 1.4 with freepbx. Thanks in advance.

Regards
Ron