My kamailio implementation sits in front of
a group of asterisk servers, when a call comes into kamailio
it does a series of checks on the location of the src and dst
to determine if the call is allowed. If the src is PSTN and
called user is found in the location table the call is passed
to an asterisk server for further processing of call
forwarding options / voicemail / ring time setting etc.
However if the called account is not found (not currently
registered) the call is then discarded and voicemail etc can
never be accessed.
I can add a avp_db_query to fetch user from
the subscriber table vs location table lookup. Just wondering
if there are any built in functions or other efficient ways to
handle this that others are doing.