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WebMar 1, 2011 · An IP telephone system uses packet-switched Voice over IP ( VoIP ), or Internet telephony, to transmit telephone calls over the Internet as opposed to the circuit … WebJun 14, 2024 · IP phone systems leverage a special protocol, known as SIP (Session Initiation Protocol), to connect calls from a desk phone, mobile app, or browser to the public switched telephone system (PSTN). Call handling software replaces an old-fashioned PBX system and is used to route calls to the correct extension or device. WebIP-Enabled Services Voice over Internet Protocol (VoIP), is a technology that allows you to make voice calls using a broadband Internet connection instead of a regular (or analog) phone line. shannon tyree