VoIP spam will become severe problem preventing from generalization of VoIP service. For the purpose of presenting multi-leveled anti-spit framework, we divided VoIP service domain into three independent domains as an outbound, an intermediary, and an inbound domain. The proposed framework enables administrator to establish anti-spit policies in each domain. In outbound domain, the framework fo...

Internet Telephony is realized by way of instant messaging and the transmitted data are voice rather than text packets, therefore it is more difficult to identify and/or prevent Spam over Internet Telephony (SPIT) than SPAM  junk e-mail. With the rising popularity of Voice over IP (VOIP), SPIT becomes a serious issue on security nowadays. This paper proposed an effective SPIT defense system, w...

I n general, “spam” describes information, often dubious in nature, sent to numerous recipients without their prior consent. Although the term typically refers to emails about hot stocks, revolutionary medicine, or adult content, spam can apply to all kinds of messages. Examples range from telemarketing calls and short message service texts to bulk mail and faxes. Since the first incident in th...

Voice over IP (VoIP) introduces new ways of communication, while utilizing existing data networks to provide inexpensive voice communications worldwide as a promising alternative to the traditional PSTN telephony. SPam over Internet Telephony (SPIT) is one potential source of future annoyance in VoIP. A common way to launch a SPIT attack is the use of an automated procedure (bot), which generat...

Session Initiation Protocol (SIP) is a new and emerging protocol that is used to establish and release the connmsction between two end systems. It is used in preference to the older H323 protocol. Both protocols provide a similar set of services hut SIP is much simpler because it has less logical components. This paper describes the implementation of a VoIP applicationusing SIP as the handshaki...

Voice over IP (VoIP) is a key technology, which provides new ways of communication. It enables the transmission of telephone calls over the Internet, which delivers economical telephony that can clearly benefit both consumers and businesses, but it also provides a cheap method of mass advertising. Those bulks unsolicited calls are known as SPam over Internet Telephony (SPIT). In this paper we i...

We propose a novel online monitoring approach to distinguish between attacks and normal activity in SIP-based Voice over IP environments. We demonstrate the e ciency of the approach even when only limited data sets are used in learning phase. The solution builds on the monitoring of a set of 38 features in VoIP ows and uses Support Vector Machines for classi cation. We validate our proposal thr...

While VoIP enables new means for communication, it may also provide a new way of transmitting bulk unsolicited messages and calls, namely SPam over Internet Telephony (SPIT). In this paper, we present the phases of a SPIT management process and we form a set of SPIT identification criteria, which are needed in order to characterize a call as SPIT, or a caller as spitter. Then, we present briefl...