Bienvenido
This is the place where you can download the booklet, about how to write telephony applications using Asterisk + AsteriskJava + SIP + SIPp.
The booklet takes you through the process of developing a simple telephony application made using the stuffs mentioned above. Along the way (I hope) you'll develop a firm basic understanding of those stuffs, and be ready for your further adventure in telecommunication application development.