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pcapsipdump is libpcap-based SIP sniffer with per-call sorting capabilities. It writes SIP/RTP sessions to disk in a same format, as "tcpdump -w", but one file per SIP session (even if there is thousands of concurrent SIP sessions).
Getting started: http://pcapsipdump.sf.net/
The NetUP ndsad utility captures IP-traffic from network interfaces and export NetFlow v.5.Data is gathered from libpcap library on Unix and from winpcap on Windows.Also you are able to use tee/divert sockets on FreeBSD and ULOG on Linux for data source.
Outback is an easy-to-use packet sniffer/packet analyzer. It provides logging to a file and offline reading. It is based on the libaries libnet an libpcap. Outback can analyze, means printing header info, UDP,TCP,ARP, ICMP, IGMP, DNS. So have fun!