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„Types“ of VoIP freely accessible servers (proxies) on the public Internet (ala e-mail) servers on the public Internet, but requiring authentication servers in private networks, accessible from the public Internet via a Session Border Controller (SBC) servers in private networks, accessible from the public Internet via a Session Border Controller, requiring authentication servers in private networks, accessible only via SBC from other private networks, eventually via a commonly shared network (extranet) servers in private networks only reachable via the PSTN users on a PSTN network which is connected to the Internet via gateway acting as SBC. etc. Note: “private” networks may be end-user networks, corporate networks or “NGNs” (service provider networks) |