asterisk users - Jul 2004 - Hardware platform / features

I'm  new to asterisk, I have some questions regarding the hardware required.
For a complete E1 and something like 30 phones, what hardware would be required
? What is the bottleneck ? Memory, processor speed ? Any experiences of how much
scalability does the asterisk have ?
Can Asterisk have "virtual PBXs", that is, have different offices
connected to it, completely independent one to another.
Thanks,

Matias
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