Voice over IP (VoIP) services over a compelling alternative to traditional telephony services. VoIP provides comparable levels of quality and features but at a fraction of the cost plain old telephone service (aka "POTS"). As with any network service, there are security issues to contend with. VoIP is subject to general threats that affect other services, such as denial of service attacks, as well as some more limited range attacks, like threats to Session Initiation Protocol (SIP). (SIP may also be used for multimedia communications and streaming multimedia so attacks against it are not strictly VoIP specific). In spite of risks associated with voice over IP services, businesses are adapting it because of favorable costs, benefits of messaging consolidation, and additional features available in VoIP systems. If you have adopted or are considering a move to VoIP, here are some security issues to consider when planning and maintaining your deployment:

• Spit, or voice over IP spam
• Vishing, voice over IP phishing
• Denial of service attacks
• Data leaks
• VoIP device configurations and spoofing attacks

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