Evolution of Quality of Service in IP Networks
The Internet is an interconnection of networks, or clouds. Individual networks are administratively distinct and opaque (or should be) to outsiders. The emphasis is on rich connectivity that allows data packets to find new routes, even if some part of the old route fails during a connection. This is possible because each packet is routed separately. In contrast, the telephony network routes calls, using the same path for the duration of the call. Failure of some portion of the pre-arranged path thus results in the loss of the call.
Please disable any pop-up blockers for proper viewing of this Whitepaper.