I'm observing many strange CDRs like the following:
<?xml version="1.0" ?> <row><d>36</d><dr>62</dr><f>"Testuser" <sip:41@1166675.test.gr></f><fu>408</fu><iu>408</iu><l>gr</l><sf>3810/181/439/520/364/102</sf><sr>9/96/194/471/969/1350/1232/639/160</sr><src>udp:94.65.212.92:14963</src><t><sip:695559555@1166675.test.gr></t><ts>1247658658</ts><tt>15</tt><y>extcall</y></row>
where I can see that a valid PBX user:
<fu>408</fu>
is making a call to an external number (in this case a mobile number in Greece):
<t><sip:695559555@1166675.test.gr></t>
but the system is not recording data neither for <ca> nor for <cn>
In many other cases the ca and cn are properly recorded.