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Hi, I'm planning to use a Asterisk with Digium E1 cards, I understand that using a codec such as G.729 can be very CPU demanding. What are the real advantages of using a codec such as G.729 ? Bandwidth only ? Using no compression wouldn't increase the scalability of my asterisk PBX ? This is considering I have no bandwidth issues in my network. Thanks

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