Patent ID: 8718048

Claim:
A method of routing internet protocol based calls, comprising: receiving a call routing query at a telephone number mapping database in a network that includes both an internet protocol based communications system and another communications system, wherein the call routing query originates outside the network and requests call routing information for a terminal; providing, in response to the call routing query, call routing information that includes an address of a network entry point to the network; receiving a call setup request at the network entry point, wherein the call setup request requests setup of a call with the terminal; forwarding the call setup request to a common communications core in the network that is common to both the internet protocol based communications system and the other communications system; transmitting a query to a private telephone number mapping database that contains routing information for terminals in both the internet protocol based communications system and the other communications system requesting routing information for the terminal; and receiving routing information for the call setup request from the private telephone number mapping database.