About the Authors

Lee Dryburgh, BSc MIEE, is a specialist in SS7/C7 and the services it empowers. He provides training and consulting through his company, Bit Tech Limited. His entire career has focused on SS7/C7. He has uniquely tackled the subject from many career positions, including software engineering, testing, training, security auditing, and architectural design, in both fixed-line and cellular networks. He is a member of several professional telecommunications bodies and holds a degree in computer science. He is currently studying for an engineering doctorate at the University College of London.

Jeff Hewett is a technical leader at Cisco Systems and is currently working in Voice over IP software development for the Government Systems Business Unit. Having been involved with SS7 for more than 16 years, he has worked in SS7 software development, testing, and training. He is a patent holder in SS7-related software development and has written about SS7 in popular journals. He has provided a broad range of SS7 training for Regional Bell Operating Companies, independent operators, and telecommunications vendors dating back to the initial rollout of SS7 in the U.S. network. In recent years, Jeff has been involved with Operating System development and Voice over Packet solutions as an engineer in the Cisco Networked Solutions Integration Test Engineering (NSITE) lab. Prior to joining Cisco, he worked in SS7 and AIN software development for a major switching vendor. He holds degrees in science and engineering and computer information systems.