With the increasing usage of IP telephony, and phones calls made via internet connections, Spam Over Internet Telephony, or SPIT, could become a far bigger problem than email spam.
Spit is particularly annoying because a call is more intrusive than a spam email. What’s more, spam filters don’t block spit since the content of a call is only known once it has been made. Existing [but not very effective] efforts to block spit range from tests to ensure the caller is human, to analysis of users’ internet traffic.
