Cisco Systems’ revelation last week of two security alerts and fixes for CallManager, the processing component of its voice-over-IP technology, reminds us that while VoIP offers all sorts of benefits, there’s no getting around its vulnerability as a software application. CallManager’s vulnerability to denial-of-service attacks–which could prevent legitimate users from accessing a VoIP network–and attacks that would let users increase their access privileges seem mild compared with threats aimed at stealing customer data or blocking Web-site access. But as more voice communication travels over the Internet, reducing that threat becomes increasingly important. Infonetics Research predicts spending on VoIP will grow from $1.2 billion in 2004 to $23 billion in 2009. Full Story