Abstract
Voice over IP (VoIP) promises to up-end a century-old model of voice telephony by breaking the traditional monolithic service model of the public switched telephone network (PSTN) and changing the point of control and provision from the central office switch to the end user’s device. Placing intelligence at the edge, in the Internet tradition, has a number of consequences: a wider community of developers - in particular the large community of Web service developers - can work on voice applications; open interfaces and decomposable functionality facilitate multi-vendor and homegrown solutions; and open source and nonproprietary software development can facilitate innovation and experimentation.
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