Lee Dryburgh, BSc MIEE, MIEEE, AMBCS, is an SS7/C7 specialist, who focuses on SS7/C7 services and next-generation solutions. Lee has worked with SS7/C7 throughout his entire career, approaching the subject from a number of perspectives, including software engineering, testing, training, security auditing, and architectural design, in both fixed-line and cellular networks, including 3G. Currently, Lee provides SS7/C7 training and consulting through his company, Bit Tech Limited. Lee 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, focusing on SS7oIP issues.