Asterix phone systems in a box?

[Neil Joseph Schelly]

I may soon have a need to acquire a phone system rather quickly.  Is there a 
purchaseable asterix phone system in a box that can support <15 extensions 
and voicemail boxes, as well as a few shared outgoing phone lines?  

If the hardware exists to make it somewhat easy to support, I may just want to 
buy it and figure out the installation/configuration on my own time.
-N