for begginer, it only explains basic elements in PBX, and basic terms of VoIP with Asterisk

definitively for beginners and people without experience working with PBX or VoIP

This book give an intruduction to the basics elements in PBX,
and when talking abount VoIP, it just make reference to Asterisk Configurations

and about security, please this book only make reference to some basic of security isues

Other Reviews

• Good book for telecommunications people
• for begginer, it only explains basic elements in PBX, and basic terms of VoIP with Asterisk
• Practical VoIP Security