回复：自己跑pbx每个月电费大概就要10块钱

Running PBX is too much for me as I am not planning to do anything complicated. Maybe a software PBX - 3CX is an option.

做了一个简单的计算：netbook 大概24watt，PG&E的average rate is about $0.185/kwh，then

24/1000 * 24 * 30 * 0.185 = $3.2 per month

实际上，我的netbook不必一直开着，只是在出门的时候开一下。

不知道这个选择如何？