Implementation and evaluation of a mobile tetherless VoIP/PSTN gateway


A voice-over-IP (VoIP) gateway bridges IP-based packet-switched networks (i.e. Internet) with public circuit-switched telephone networks (i.e. PSTN). The key building block of a VoIP gateway is a telephony card that interfaces with the PSTN and converts signals from the PSTN to bits that can be manipulated by a computer and vice versa. Because commercially… (More)