Origination in VOIP telephony refers to calls that originate in the Public Switched Telephone Network. Voice-over-Internet protocol ( VoIP, vɔɪp is a protocol optimized for the transmission of voice through the Internet The public switched telephone network ( PSTN) is the network of the world's public circuit-switched Telephone networks in much the same way that the These calls are carried to their destination over the Internet. The Internet is a global system of interconnected Computer networks