If you do not already know, Issabel is the continuation of Elastix UC PBX since the latter was taken over by 3CX and has since been killed off. So if you are looking for an upgrade of Elastix 2.5 or the shortlived Elastix 4, then Issabel is what you are looking for
If you have trying to install Issabel on HP Proliant DL380p Gen8 through USB drive and have failed miserably like I did, then you need to install it using iLo
Sometimes the iLo remote control hangs so all you need to do is the start of the installation through iLo, keep that session open by not closing any window etc, then finish up the installation directly on the server itself with a traditional monitor/keyboard etc.
