Voice over Internet Protocol (Voice over IP, VoIP) is any of a family of methodologies, communication protocols, and transmission technologies for delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms frequently encountered and often used synonymously with VoIP are IP telephony, Internet telephony, voice over broadband (VoBB), broadband telephony, and broadband phone. Internet telephony refers to communications services as well as voice over internet protocol services â€" voice, fax, SMS, and/or voice-messaging applications â€" that are transported via the Internet, rather than the public switched telephone network (PSTN). The steps involved in originating a VoIP telephone call are signaling and media channel setup, digitization of the analog voice signal, encoding, packetization, and transmission as Internet Protocol (IP) packets over a packet-switched network. On the receiving side similar steps reproduce the original voice stream. Managed Voip solutions employ session control protocols to control the set-up and tear-down of calls as well as audio codes which encode speech allowing transmission over an IP network as digital audio via an audio stream. The codec used is varied between different implementations of VoIP (and often a range of codes are used); some implementations rely on narrowband and compressed speech, while others support high fidelity stereo codes. Voice over IP has been implemented in various ways using open protocols and standards. Examples of technologies used to implement Voice over IP include:
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