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<p>The central assumption of the plain old telephone service (POTS) was network-based computing power and dumb end systems. Implementing the pretty amazing new services (PANS) of IP-based telephony requires a shift in services at the network perimeter.</p>
Ping-Fai Yang, Henry Sinnreich, David Shrader, Henning Schulzrinne, Christos A. Polyzois, K. Hal Purdy, François Ménard, "From POTS to PANS: A Commentary on the Evolution to Internet Telephony", IEEE Internet Computing, vol. 3, no. , pp. 83-91, May/June 1999, doi:10.1109/4236.769426
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