i have to represent SIP REGISTER TIME, SIP INVITE TIME, AND SIP BYE TIME VS. DELAY in ims with ns-2 simulator at first i started with the script example.tcl from http://code.dma.unipi.it/projects/ns...tcl?format=txt
and i had to modify this script to add P-CSCF, I-CSCF and S-CSCF also terminals are not located in there home network
should i modified routers sited in this script to servers?
node 2 to P-CSCF , node 3 to S-cscf and adding other nodes to forward the invite message to the appropriate I-CSCF
and how can i do that ?
please i need your guide to write this tcl script and this is my first project with ns-2

Much the same as with your other threads:
http://www.linuxquestions.org/questi...on-4175557502/
http://www.linuxquestions.org/questi...857/page2.html
http://www.linuxquestions.org/questi...-a-4175557983/

You can do it, by writing your TCL code TO DO IT. There is ample documentation, you have scripts..now it is time for YOU, PERSONALLY to start applying what you've been told/given. If you have an actual problem, post the code that you have written, and tell us what error(s) you're getting.

Since you 'need our guide', you've been given it several times in the past. Again, apply what you've been told/given.