Patent ID: 7756518

Claim:
An automated method for minimizing call setup delay for a call in a plurality of communication networks having different wireless networks having different wireless technologies associated with the respective networks, wherein the plurality of communication networks includes a central node connected to a number portability database, the method comprising: triggering a first query to the central node for information for routing the call when a request for setting up the call is received by a switching unit, wherein a plurality of tables are available to the central node to respond to the query, if appropriate, and route the call, and wherein the central node communicates with the plurality of communication networks using a plurality of protocols; triggering a second query from the central node to a home location register for the routing information in order to set up the call, wherein the second query is only triggered if a location routing number is not found in a second table; and triggering a third query from the central node to the number portability database, wherein the number portability database contains a database containing information on each of the wireless networks having different technologies needed for a call set-up procedure, for the routing information if the second query fails to provide the routing.