Steve Stecklow is one of the few reporters that has continued to write about Iran’s acquisition of surveillance equipment for the past several years. At this point he has a good grasp of how the technology gets into the country, what’s done with it, and why and how vendors are evading sanctions. His article earlier this year provides a good look at how Huawei and ZTE alike have sold ‘lawful intercept’ equipment to the Iranian government. I’d highly recommend taking a look at what he’s written.