Prospective users of Voice over Internet Protocol equipment and plans are often put off by a major concern: is VoIP secure? Many accounts of cyber attacks, phishing, denial of service, data theft, and even eavesdropping have made enterprises weary about VoIP. Corporations using internet protocol private branch exchange systems simply cannot allow call interception, exfiltration of data via media session, or malware to be embedded in signalling and media sessions, which can contaminate the whole enterprise network of computers and servers.
However, secure VoIP is within reach thanks to the various security measures that VoIP providers have put in place.
- First, calls can be encrypted, following several encryption standards. Secure wireless networks can also be used.
- Against denial of service attacks, session border controllers with built-in DoS countermeasures may be effective.
- Against theft of service, authentication features of VOIP protocols can be used.
- To ensure secure VoIP communications, at least as long as media exfiltration risks are concerned, deep packet inspection of all outgoing media streams is required.
- This routine will have to be extended to deep packet inspection of all incoming signalling and media streams to protect against the embedding of signalling and media sessions.
But the most secure protection in order to enjoy secure VoIP is certainly to disregard the use of public internet for media sessions, and choose Sip trunking instead. By using dedicated connections, in addition to benefits related to connection speed and sound clarity, Sip trunkinggreatly limits the risk of malevolent intrusion into VoIP communications.
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