Let the SPIT (Spam over Internet Telephony) Wars Begin
If SPAM arrives in your inbox at 4am, the chances are your antispam software will catch it. But even if it doesn’t, you won’t lose much sleep over its arrival. But it’ll be a different story with SPIT (spam over internet telephony). Junk phone calls at 4am are going to drive you mad because the chances are that antispit software won’t be able to intercept the call.
Today, Andreas Schmidt and pals from the Fraunhofer-Insitute for Secure Information Technology in Darmstadt Germany explain why intercepting SPIT is so much harder than spotting SPAM. The main difference between junk calls and junk email is that the email arrives at your mail server before you access it. This gives the server time to analyse its content and filter out the junk before it gets to you.
Internet telephony, on the other hand, goes straight through to you in (more or less) real time, giving your server little or no time to analyse its content.
There are still a number of strategies that could be employed to filter out SPIT. For example, white lists that allow only calls from predetermined callers, Turing tests such as audio CAPTCHAs that make a caller prove he or she is human and payment-at-risk services where the caller makes a small payment in advance and is refunded immediately if the receiver acknowledges the call as legitimate.
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Posted to VoIP Security