asterisk users - Nov 2008 - asterisk src=dst

Hi all
I saw in the CDR stocked in mysql as well as those in the csv file that 
some time, the src field is the same as the dst field which is the 
extension.
When does it happens.

Here, we have 4 dgits extensions and most of the time the dst field is 
the extension and the src field is the 10 digit customer phone number.

Do you know when does this happens ??

Thanks


Ruddy Gbaguidi
http://www.astblog.com