Book for understanding Internet Telephony?

Question

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.

Answer 1

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