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Can you capture VoIP sessions/calls with Sniffer type products?

Carrie Higbie EXPERT RESPONSE FROM: Carrie Higbie

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QUESTION POSED ON: 12 April 2004
Is it possible for someone to "tap into" the network and capture VoIP sessions/calls much in the same way that can be done on the data network with Sniffer type products?

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It is definitely possible for someone to "tap into" the network and capture VoIP sessions and calls. One with administration rights on a switch can enable mirroring record or snoop on voice traffic. One application from Clear Sight networks allows you to clearly see RTP streams and play them.
http://www.appdancer.com
Some VoIP systems and phones support standards based encryption of the voice stream so that snooping on the voice stream is not possible. One such system is the MX250 from Zultys Technologies:
http://www.zultys.com/summary_MX250.htm


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