Yes, we offer both to rent and to onetime installation to your server.
Yes, we give training and others tutorial documentation with videos. Usually we provide an online session but also when requested we provide onsite training, it can be in our offices or at customer.
Yes, we work with the datacenter in USA and Europe an can offer you a full of package including server, backup, IP addresses etc. If you are asian, we have high redundant singapore server also we care about terminated and call genaration server location which you get better call quality to fine tune. We can suggest you which colocation is better for your termination.
Sorry, no. We use C#, .NET, WPF, and some other Microsoft technologies which make the development more effective. We may support Linux in the future.