Enric Peig Olivé's Open Networks PDF

By Enric Peig Olivé

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The future seems to be pointing towards the abandonment of both traditional and mobile switched telephone networks.

323 environment. 323 terminals, it is not needed. • Gatekeeper. 323 network and it provides important services such as addressing, terminal authorisation and authentication, bandwidth management, billing etc. However, it is not needed when establishing communications between terminals. It is optional despite the services it provides. This is a fact. We can also establish calls without gatekeepers. • Multipoint�control�unit. 323 terminals. They must all establish a connection with the MCU which is then in charge of managing communications between all of them.

Some of these were developed in the free programming world and others are proprietary: • Skype. It is the best known example of a proprietary VoIP environment. It was created in 2003 by the people who wrote Kazaa, Janus Friis, a Dane, and Niklas Zennström, who is Swedish. The application is free, but the environment is closed. It also allows calls to be made from a PC to fixed lines for a modest price. Calls between PCs using the software are free. The application allows for the exchange of voice, image, video and text information, and provides additional services such as audio and video conferencing, an answer machine, call forwarding etc.

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Open Networks by Enric Peig Olivé


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