VoIP gets handle on protection - Financial Post 13-Mar-2008

An interesting taxonomy of VOIP security threats (standard view; print-formatted: VoIP gets handle on protection ):

"...VoIPshield Systems Inc., an Ottawa-based software firm that develops products to secure voice communications on IP networks, warns that attacks on VoIP systems can fall into one or more of five categories.

These include privacy intrusion (call eavesdropping, call recording and voice mail tampering); availability (denial of service attacks, buffer overflow attacks and malware); authenticity (registration hijacking, caller ID spoofing and sound insertion; theft (toll fraud/service theft) and data theft through masquerading data as voice and data network crossover attacks; and voice spam, known as SPIT, which includes unsolicited calling, voice mailbox stuffing, and something called vishing (voice phishing)..."