You're seeing the post. That shows the error is within your application.
To avoid any lost CDRs ensure your script returns a 4xx or 5xx error on any error. You can configure FS to write these to the err-log-dir so that they aren't lost and resubmit them when the error is fixed. Remember you should always check the result of mysql_query-type function calls.
If the script returns 200 then FS will assume the CDR submission was successful.
Assuming the webserver is apache, check the error_log file, you may see output indicating what the problem is.
Since you changed the schema it's almost certainly a SQL error relating to the columns (not enough supplied or names changed).
-Steve