Patent ID: 6233331
Filing Date: 2001-05-15
Classification: H04Q

Abstract:
A method for reducing post dial delay in a network 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 and whether the cached location routing number is reliable;while said step of checking said cache is performed, if said cached location routing number is unreliable, querying a database that correlates portable numbers to respective location routing numbers to determine a location routing number for said portable number from said database;if said step of checking determines a location routing number for said portable number has been cached and is reliable, then attempting to route the call to said portable number using location routing number response information from said cache; andif said step of checking determines an unreliable location routing number for said portable number in said cache:receiving location routing number response information corresponding to said portable number from said database in response to the step of querying, andattempting to route the call to said portable number using said location routing number response information received from said database.