Determines whether this call details entry is used in a search of call details for an incoming call based on the
contents of the called subaddress information in the incoming SETUP message. The value 'off' means that this call
details entry is not used in the search. The value 'local' means that the call details entry is used in the search
and the called subaddress information is compared with the call details entry name. The value 'remote' means that
the call details entry is used in the search and the called subaddress information is compared with the call
details entry remote name. A number of searches are carried out until a matching call is found. First a search
against the called subaddress in the SETUP message, then a search against the user-user information in the SETUP
message, then a search against the calling number information in the SETUP message, then a search for any call
that is configured to respond to any incoming call.