Origination: in IP Telephony/VoIP an origination is a process of taking a call off the Internet or from PSTN lines and sending to the destination (called party) over Internet network by an ITSPs.
OSP: stands for Open Settlement Protocol. A client/server protocol used by Internet service providers to exchange authorization, accounting, and usage information to support IP telephony. Open Settlement Protocol is implemented in voice telephony gateways such as softswitches, H.323 multimedia conferencing gateways, and Session Initiation Protocol (SIP) proxies. Reference Wikipedia.
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