Patent ID: 8228903
Filing Date: 2012-07-24
Classification: H04L,H04M

Abstract:
1. 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: store at least one call attribute of at least one public switched telephone network (PSTN) call initiated over the PSTN by a private branch exchange (PBX) to a destination telephone number, the at least one call attribute demonstrating knowledge of the at least one PSTN call; verify a destination Voice-over-Internet-Protocol (VoIP) call agent is reachable over the PSTN at the destination telephone number based on demonstrated knowledge by the destination VoIP call agent of the at least one call attribute of the at least one PSTN call initiated over the PSTN to the destination telephone number; and route a call to the destination telephone number either over a VoIP network to the destination VoIP call agent if the destination VoIP call agent is verified as reachable over the PSTN at the destination telephone number, or over a circuit switched network from the PBX if the destination VoIP call agent is not verified as reachable over the PSTN at the destination telephone number.