Yesterday we got and installed latest Xubuntu/Kubuntu/Ubuntu 12.10, then we installed latest miniSipServer V10.5 on these platforms.
The result is perfect! It is no problem to run MSS without any modification.
In another way, we would like to suggest Xubuntu and Kubuntu. According to our test result, Ubuntu system is very slow, however Xubuntu and Kubuntu are perfect.