Dear sir,
I work for Packt Publishing and we would like to offer a free chapter
to all the viewers on this site from our Asterisk Book “Building Telephony Systems With Asterisk”.
Free Sample chapter Link :
http://www.packtpub.com/files/Asterisk_Chapter_Making_a_Plan_For_Deployment.pdf
Book Link :
http://www.packtpub.com/asterisk/book