Patent ID: 8279852

Claim:
A method of associating a telephone subscriber number with a Voice Over Internet Protocol (VoIP) carrier, comprising: querying a plurality of VoIP carrier servers to retrieve a plurality of messages operable to determine whether the telephone subscriber number is found within any one of the plurality of VoIP carrier servers; when the received plurality of messages is at least one of inconclusive or when the telephone subscriber number is not found within any one of the plurality of VoIP carrier servers, placing a first partial call to the telephone subscriber number from a first VoIP number within a first VoIP carrier network and placing a second partial call to the telephone subscriber number from a second VoIP number within a second VoIP carrier network to retrieve a first signal from the first VoIP carrier network and a second signal from the second VoIP carrier network; and based on the first and second received signals, determining whether the telephone subscriber number belongs to the first or the second VoIP carrier network.