From HiPBX Wiki

This is just some temporary documentation outlining what needs to be done to a standard CentOS5 build to make it work.

Note that this is referring to SL6, until C6, if ever, gets released.

Admittedly, most of this work is a duplication of the TrixBox/A@H project.

I found some 'howto' steps for the Twinstar stuff here, which talks about Elastix. That should be good enough to start with.

yum groupinstall "Development tools"
yum install atrpms-repo    # For fxload, iksemel and spandsp
yum install epel-release # for php-pear-DB, soon to be removed as a prereq.
yum install libusb-devel 
yum install fxload
yum install iksemel iksemel-devel
yum install httpd php php-fpdf
yum install mysql-server
yum install curl
yum install mysql mysql-devel
yum install php-pear-DB php-process
yum install libxml2-devel ncurses-devel libtiff-devel libogg-devel
yum install libvorbis vorbis-tools