When trying to launch the pcscf.sh, you may encounter OpenIMSCore hanging, and displaying the message:

./pcscf.sh: line 4: setkey: command not found
./pcscf.sh: line 5: setkey: command not found

I was able to fix this problem on Ubuntu 10.04 LTS by opening a terminal and typing:

sudo apt-get install ipsec-tools

Apparently, setkey is included with the ipsec-tools apt-get. After the install, my issues with this particular error went away.