Patent ID: 6421442
Filing Date: 2002-07-16
Classification: H04M

Abstract:
A method for reducing post dial delay in a network that providing a number portability environment, the method comprising the steps of:receiving a dialed number; recognizing said dialed number as a portable number; checking a cache to determine if a location routing number for said portable number has been cached; querying a database that correlates portable numbers to respective location routing numbers to determine a location routing number for said portable number; if said step of checking determines a location routing number to be cached for said portable number then attempting to route the call to said portable number using location routing number response information from said cache; receiving location routing number response information corresponding to said portable number from said database in response to the step of querying; and if said step of checking determines no valid location routing number to be cached for said portable number, then attempting to route the call to said portable number using said location routing number response information received from said database.