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What kind of hardware to you use (besides the boxes themselves)? Is everything a VOIP phone with an RJ-45 jack, or do you also use add-on cards and other telephony goodies?

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If you want POTS, you get a telephony card from Digium. If all you want is VOIP, then you can use your box as-is.

Might be outdated, but you TFoT2 is free:

http://astbook.asteriskdocs.org/

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