Patent ID: 6678265
Filing Date: 2004-01-13
Classification: H04L

Abstract:
A method for connecting a call in an IP telephony system having two or more call managers, each of said call managers operating as a centralized control center for the set-up and tear-down of calls to directory numbers served by said call managers, the method comprisinga) an individual one of said call managers i) receiving a dialed directory number; ii) sending a query to an IP local number portability database to determine if the received directory number has been ported; and iii) attempting to connect the call using the received directory number if the received directory number has not been ported; b) if said received directory has been ported, said individual one of said call managers iv) receiving a new directory number from said database; v) determining whether the new directory number is served by said individual one of said call managers or by another one of said call managers; vi) attempting to connect the call using the new directory number if it is served by said individual one of said call managers; and vii) transferring said new directory number to an other one of said call managers if said new directory number is served by said other one of said call managers; c) said other one of said call managers receiving said transferred new directory number and performing at least said steps ii) and iii) using the transferred new directory number.