SPIT attacks
Spam over internet telephony (SPIT) is, as its name suggests, the VoIP equivalent of email spam. While it’s relatively rare at the moment, SPIT is likely to become more of a problem as VoIP spreads into the mainstream.
VoIP is already a brazil telegram valuable tool for unscrupulous telemarketers as it allows them to make calls at minimal cost and to disguise the origin of their calls by spoofing caller display systems. SPIT makes use of the IP address that every VoIP device must have in order to work, to send out voicemail messages. This leads to inboxes being clogged with lots of unwanted messages, making it hard for the user to get at the legitimate contents of their voicemail.
SPIT can also be used in conjunction with some of the other threats we’ve talked about, to distribute malware or to conduct phishing and vishing attacks by asking for confidential information.
VoIP systems can also fall prey to call tampering. This can be used to disrupt the call by injecting interference and noise. Hackers can also interrupt the delivery of the data packets that make up the call, making the communication intermittent.
Tampering can be carried out by what is known as a man-in-the-middle attack. This means that the attacker intercepts the call data and diverts the call via their own servers. This allows calls to be hijacked and redirected and hackers to masquerade as a legitimate caller.