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I'm a developer, system/network administrator, and I'm very familiar in setting up internet services such as Apache, BIND, SSH, etc. but what I'm entirely new to is telephony. Is there a book or guide available somewhere to help me understand from the ground up how internet telephony works? I'd like to know how I could write service stacks on top of IP telephony for various uses.

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I'd bet the user manual for Asterisk would be a good source, and might also point you to more generic resources.

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Reading "Asterisk: The Definitive Guide" right now, extremely helpful. – Naftuli Tzvi Kay Jun 27 '11 at 22:14

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