Install OSLEC in running system *Help*

Hi. I’m Manuel, know as; gnu.
I have an Asterisk server running in my office and is working fine.
The asterisk I’m running, I complite it with: dahdi-linux,libpri,asterisk11.

I wanna install the OSLEC, I know how to install the OSLEC, but my question is:

My system is already installed and working, so, when I install OSLEC, I need to recompile dahdi? asterisk? libpri? or just the dahdi?