Patent ID: 8228902

Claim:
An apparatus comprising: a memory; and a processor in communication with the memory, the memory including computer code executable with the processor, wherein the computer code is configured to: receive at least one call attribute for each respective one of at least one public switched telephone network (PSTN) call initiated from an originating Voice-over-Internet-Protocol (VoIP) call agent over the PSTN to a destination telephone number; verify calls to the destination telephone number over the PSTN reach a destination VoIP call agent based on receipt of demonstrated knowledge by the destination VoIP call agent of at least one corresponding call attribute, the at least one corresponding call attribute determined to match the at least one call attribute for each respective one of the at least one PSTN call initiated over the PSTN to the destination telephone number, the at least one call attribute for each respective one of the at least one PSTN call demonstrating knowledge of a respective one of the at least one PSTN call; and transmit an indication to the originating VoIP call agent that a VoIP route mapping the destination telephone number to the destination VoIP call agent is valid based on the verification that calls to the destination telephone number over the PSTN reach the destination VoIP call agent.