Which method of output in XML_CDR did you implement? There are two:
1. Writing to a file on disk and then parsing the file
2. Writing to HTTP / HTTPS via POST and handle the parsing on the web server side
As in the earlier suggested solution from myself, I prefer #1. An added advantage of this is, I can see the content of the XML file in a simple text file reader, and modify my parsing script accordingly.
Usually the "sip_from_user" variable carries the "caller id". If that is true for your case, then in PHP it would be something like (assuming $sip_from_user is initiated with the corresponding XML value):
$sip_from_user = "1444" . $sip_from_user;
Regards
HASSAN