I am constantly asked the question by alumni, “I went to the SIP Tutorial years ago, has it really changed?” The answer can ...

These sessions are hosted by two of the most prominent authorities in the SIP world: Dr. Henry Sinnreich (News - Alert), and Dr ...

This tutorial details of how to write a new SIP and adding it to the website. Currently two mechanisms of providing a new SIP are ...

The iptel.org 180+ page SIP tutorial is outstanding. Another overview that is a bit more market-oriented and nearly as long.