Corporate America spends untold amounts of time and money every year to ensure that its data systems are secure from cyberattacks, but there’s one relatively low-tech flank that is often lightly guarded — office telephone systems. Federal law-enforcement officials said last week that they are tracking numerous reports of hackers who gain access to corporate voice mail and telephone systems to launch Internet attacks. The hackers, according to the Department of Homeland Security, tap into corporate phone systems — called private branch exchange (PBX) systems — using them to make long-distance calls to Internet service providers in other cities or overseas. They can work anonymously because the service providers see the activity as coming from within the company whose phone network was compromised. Full Story