If you lost your system root password, it is not possible to change it without direct access to the machine.

You need to boot the machine with our PBXware 3.x Live/Installation CD which you can download from our website.  

• In the BIOS of your machine set it to boot from CD/DVD (it is possible to do so with USB since we have USB image for booting also)
• When the system asks you whether it should continue with the installation, you should chose Exit to shell option
• Create a test folder with following command: mkdir /test
• Mount the hda1 to that test folder with: mount /dev/hda1 /test
• Chroot into that environment with: chroot /test
• Change root password with: passwd root
• When you are done changing password type exit and then poweroff to power off your machine

 Next time you power on your machine without CD/DVD/USB, your root password will be changed as per above.