Askozia (google it) is a voip server based on asterisk. It is made with T2 Linux. See the download below and the change log
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I'm looking for someone who has experience of porting this to OpenVZ or Xen and geting them to do it. Don't know what is involved as I am not very good with Linux so have a look and see if it is possible.
I have ported a lot of hardware Linux machines to virtual machines with Xen, without problem, for customers, here in my town. I have already done a project based on Xen on freelancer, too.