If your company uses the gsm voip telephony, then sooner or later you will surely come across the so-called "SPIT". SPIT stands for SPAM over Internet Telephony, i.e. spam in telephone IP-based networks.
Another name for this phenomenon is VAM (VoIP spam). In fact, it is the spread of mass advertising messages to phones connected to the Internet. We get accustomed to spam over the regular and mobile phones, and now it threatens IP-telephony, and VoIP is a particularly attractive target for marketers. This is a more efficient channel for advertising, since it makes it possible to make numerous simultaneous calls. To do a massive calling via VoIP is technically much easier than in traditional telephony since it is also cheaper.
Since the Internet network, in contrast to the PSTN is open, SPIT is virtually limitless when sending voip to gsm traffic. Unscrupulous marketers can use spam bots to collect the IP-addresses of registered phones or crack PCs to through which calls over VoIP routes are made.
There are several embodiments of SPIT. One of the most common is the substitution of the subscriber. Imagine that the call is made to the office via the corporate phone network, the company head’s IP-phone number or that one of the staff is identified, but when you pick up the receiver, you hear advertising messages.
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In addition, hackers can "attack" the signaling protocols -SIP, SCCP, etc. As a result, it becomes possible to "force" the IP-phone to make calls every 5 or 10 minutes. Just imagine if all the phones in the office will ring every 5 minutes, and of the tubes advertisements will be heard in the receivers!
It's only the most important of SPIT scenarios but they clearly show the possible consequences of spam in VoIP networks. The protection of IP-telephony from such attacks should be built on several levels that include the use of the traffic encryption protocols, firewalls for SIP (e.g., SIParator), and the border controller of sessions.
It is recommended to allocate a separate VoIP network. It can be both physical and VLAN. In this way it will be possible to hide the passing voice traffic from the public network users and control unauthorized access to the system.
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