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VoIP spam
VoIP spam or SPIT (Spam over Internet Telephony) are bulk unsolicited, automatically dialled, pre-recorded phone calls using the Voice over Internet Protocol (VoIP).〔(【引用サイトリンク】url=http://tools.ietf.org/html/rfc5039 )〕 Telephone spam is comparable to E-mail spam, but due to its synchronous character, different mitigation methods are needed.
Voice over IP systems, like e-mail and other Internet applications, are susceptible to abuse by malicious parties who initiate unsolicited and unwanted communications. Telemarketers, prank callers, and other telephone system abusers are likely to target VoIP systems increasingly, particularly if VoIP supplants conventional telephony. The VoIP technology provides convenient tools (e.g. Asterisk and (SIPp )) and low-priced possibilities to place a large number of Spam calls.
The underlying technology driving this threat is Session Initiation Protocol (SIP).〔(【引用サイトリンク】url=http://tools.ietf.org/html/rfc3261 )〕 This technology has received significant support from most major telecommunication vendors, and is showing signs of becoming the industry standard for voice, video and other interactive forms of communication such as instant messaging and gaming.
== Introduction ==
VoIP Spam or SPIT is characterized by bulk unsolicited calls using the Voice over Internet Protocol. The spammer attempts to initiate a voice session and then relays a pre-recorded message if the receiver answers. If the prevalent Session Initiation Protocol is used, the sessions are initiated with INVITE messages and the audio data is transferred using the Real-time Transport Protocol . Robocalls can be delivered automatically using telephony software, e.g. using Asterisk call files.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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