Sipat is a project mainly written in ..., it's free.
SIP Analysis and Testing tools
This project offers set of tools for testing SIP.
libosip2-dev libpcap-dev libxml2-dev
xsltproc
Call flow analyzer able to draw call flows from PCAP and verify callflows against given definition.
Usage:
cfanal -r captured-traffic.pcap -a 10.38.14.73=uac -a 10.38.14.74:5062=uas -print-cf drawing.cf
cf2svg drawing.cf drawing.svg
svg2png drawing.svg drawing.png
XSL template for painting call flow diagrams.
make install prefix=~/sw ... to install into specified directory instead of /usr/local