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Open Settlement Protocol

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OSP is a client/server protocol that Internet service providers use to exchange authorization, accounting, and usage information to support IP telephony. OSP is defined by ETSI (European Telecommunications Standards Institute) Project TIPHON (Telecommunications and Internet Protocol Harmonization Over Networks).

OSP provides a way for ISPs to support billing for voice and fax over IP services. The protocol is implemented in voice telephony gateways such as softswitches, H.323 multimedia conferencing gateways, and SIP (Session Initiation Protocol) proxies.

Settlements are based on per-minute charges like the existing PSTN. With settlements in place, IP telephony can expand beyond the confines of single service providers or confederations of service providers into a global service.

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