Vomit (spelled all lower-case) is a Unix software utility that takes IP telephony packets captured by another Unix tool, tcpdump, and reassembles them into a Wave file that can be listened to over a computer's speakers. Although vomit can be used for network debugging or as a speaker-phone utility, it is most often associated with VoIP eavesdropping attacks.
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"Vomit" is an acronym for Voice Over Misconfigured Internet Telephones. The name is somewhat misleading. The telephones are not actually misconfigured; they are simply using the same data stream as the network's computers. To ensure that data network users cannot snoop on IP telephony calls by using a program like vomit, it is recommended that network administrators always separate voice and data networks by running them on different virtual LANs (VLANs).