WSJ.com - Redialing the Internet Frenzy?

As demand grows for systems that use a technology known as "voice over Internet protocol," or VOIP, investors already have driven up shares of companies hoping to corner the latest hot tech market. SpectraLink Corp., a Boulder, Colo., company serving the new market, has seen its stock more than quadruple in the past year -- a typical run-up in a sector that some investors say is starting to smell like the Internet business in the late 1990s.