Stephen P. Olejniczak’s trio of telecom books, Telecom for Dummies, Asterisk for Dummies, and VOIP Deployment for Dummies is a culmination of the service knowledge and wisdom he gained over 12 years in the telecom industry. As a customer service manager and lead troubleshooting technician, Stephen has taught thousands of employees, customers, and salespeople about telephony and the telecom industry.