Thursday, February 4, 2016

SIP,RTP capture with tshark and TCPdump

Tshark command to capture both SIP and RTP on media servers

This is useful if you don't know on which port SIP and UDP packetes comes from and can dump in pcap

tshark -i eth0 -w capture.pcap -f "(udp port sip) or (udp[1] & 1 != 1 && udp[3] & 1 != 1 && udp[8] & 0x80 == 0x80 && length < 250)"

-i  : specify your interface, If not use "any" to capture on all interfaces
-w : file to save


TCPdump to capture SIP on specific port! 
tcpdump -nqt -s 0 -A -i eth0 port 5060

Grep both SIP and UDP at same time.
tcpdump -n -i eth0 | grep 'SIP\|UDP'

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