I've been to a computer trade fare in Iran (just over a decade ago) and, despite US embargoes on computing equipment, you could buy servers and mostly any commercial off the shelf product you wanted. They come from various countries in the middle east and are slightly overpriced but not greatly. These trade restrictions don't work well and just harm small business, not the government. You can buy pirated software from stores - Iran has a interesting view on Copyright.
What is working is the recent move against Iran's banks. It's hard to pay for things, so exporters are finding it hard to do business.
ZTE will sell the kit to some unknown Chinese company who'll then provide it to Iran... if they can work out a way of getting paid. Gold bars look cool but are damn inconvenient to deal with.