Integrating voice and data networks pdf

Voice over Internet Protocol VoIP , also called IP telephony , is a method and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol IP networks, such as the Internet. The terms Internet telephony , broadband telephony , and broadband phone service specifically refer to the provisioning of communications services voice, fax , SMS , voice-messaging over the public Internet, rather than via the public switched telephone network PSTN , also known as plain old telephone service POTS. The steps and principles involved in originating VoIP telephone calls are similar to traditional digital telephony and involve signaling, channel setup, digitization of the analog voice signals, and encoding. Instead of being transmitted over a circuit-switched network , the digital information is packetized and transmission occurs as IP packets over a packet-switched network. They transport media streams using special media delivery protocols that encode audio and video with audio codecs and video codecs.

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