Version 4.01 offers added functionality with "click-to-call", conferencing and certificate management. Instructions to upgrade are here:
It's a good idea to backup before the upgrade, and backup again immediately afterwards. We've noted the upgrade takes a while after reboot to show services in the proper state the first time, so patience is a must.
We've also observed adding a web certificate requires a reboot or the system will not function, so don;t add it until you are ready to reboot.