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Check out the Oreka VoIP Sniffer 0.5 for some VOIP Security Auditing & Management purpose.

Oreka is a modular and cross-platform system for recording and retrieval of audio streams. The project currently supports VoIP and sound device based capture. Recordings metadata can be stored in any mainstream database. Retrieval of captured sessions is web based.

Oreka currently has the following features: Record VoIP RTP sessions by passively listening to network packets. Both sides of a conversation are mixed together and each call is logged as a separate audio file, Capture from multiple Network devices in parallel, Capture from pcap trace files, Voice activity detection and more.

Oreka has been reported to work on the following platforms: Cisco CallManager and CallManager Express, Lucent APX8000, Siemens HiPath, Asterisk SIP channel.

See Oreka VoIP Sniffer for Security Auditing