1.4.2. check_from()
Check From username against URI
table (if use_uri_table is set) or digest credentials
(no DB backend required).
This function can be used from
REQUEST_ROUTE.
Example 1-12. check_from usage
...
if (check_from())
{
...
};
...
http://www.openser.org/docs/modules/1.2.x/uri_db.html#AEN197