Corporate networks and computer systems are faced with a variety of threats. Unauthorized access, malware compromise, data leakage, and other threats are fairly common and administrators are used to protecting against them. However, the phone system traditionally has been a separate issue, exposed to soe threats of its own, but a horse of an entirely different color. Even the various attack vectors in the computer system and network infrastructure have typically had a degree of separation. Michael Osterman discusses some of the emerging (or merging as the case may be) threats to corporate networks posed by the implementation of unified communications in this NetworkWorld article.