How To: Install Ngrep Source to Debug SIP Packets on Asterisk, Opensips, Freswitch

First you need to download ngrep with the following command

wget http://downloads.sourceforge.net/project/ngrep/ngrep/1.45/ngrep-1.45.tar.bz2?use_mirror=iweb

Once you have the ngrep archive on your linux system extract the source with the following command

tar -jxf ngrep-1.45.tar.bz2

Then enter the directory and start the installation commands

cd ngrep-1.45/
./configure
make
make install

Now you are all done and have the ability to use ngrep as you see fit. I will have documentation on how to use ngrep for the purpose of sip debugging so come back to check it out.