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![1. Introduction to Voice over the Internet Protocol - Packet Guide to Voice over IP [Book]](https://www.oreilly.com/api/v2/epubs/9781449339661/files/httpatomoreillycomsourceoreillyimages1570734.png "1. Introduction to Voice over the Internet Protocol - Packet Guide to Voice over IP [Book]")
1. Introduction to Voice over the Internet Protocol - Packet Guide to Voice over IP [Book]
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