Gone are the days when telephones were dumb appliances that you simply plugged into the wall and forgot: Security researchers from one Internet security firm have located more than 100 vulnerabilities in hardware and software that powers the Internet-based phones used by many large companies today. Turns out, many of these same vulnerabilities may also be present in the complex, distributed networks that control your local power grid, or ensure the distribution of your drinking water. But more on that in a bit. Ottawa-based VoIPshield Systems, a company that makes products to help secure voice-over-IP (VoIP) networks, said it located more than 100 security holes in Internet-based phones made by the biggest players in the business, including Avaya, Cisco and Nortel. The company currently displays information on 44 of the vulnerabilities on its Web site, and it says many of the flaws are medium- to high-risk, meaning they could be