I interested to do a small scale call shop using astercc Commercial version. This iso is available from http://astercc.org/download/asterCC-BOX-1.1-beta1.i386.iso+%28Mirror+on+German+Server%29
the commercial version is not designed for call shop, you'd better use asterbilling, http://wiki.asterbilling.org
According to the documentation it looks like AsterCC and Asterisk are supported under Ubuntu so if you install an Ubuntu 12 32x or 64x droplet you should be able to follow their documentation to install it.
Well known Asterisk Pbx with Astercrm. More details @ http://astercc.org/
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