At one point Iran was slated to acquire Russia's advanced S-300 (NATO: SA-10 "Grumble") air defense missile series launchers by way of import and Iranian military personnel were being trained on its operation when a ban was instituted on the product by the Russian government. This spurred Iranian industry to design, develop and manufacture a suitable replacement, the end result becoming the "Bavar 373" which, as of this writing (2015), remains in active development. The move marks another indigenous endeavor by the oil-rich Gulf nation to become self-sufficient in all things military - the country has already put into action various small arms, armored vehicles and aircraft from within, though many are based on existing imported designs.
The initial Bavar 373 (Bavar meaning "Belief") prototype was made available in late 2011 and Iranian officials went on to claim that it was to become a more potent variant of the S-300 missile family. As with the Russian design, the large missile (named locally as "Sayyad-3") is carried in four launch tubes sat atop a military truck (the Zoljanah 10x10 wheeled) with enclosed driving and operations cab. Onboard phased array radar will be used to direct the primary functions of the system while the wheeled nature of the truck chassis will allow for relatively quick relocation in an active battlefield setting. Systems carried aboard will be tied in to the current Iranian air defense network for a more accurate response to incoming aerial threats (including cruise missiles) while the communications set will be fully protected from "wandering ears" of the enemy.
It was expected that the Iranian military was to have stocked its inventory with the Bavar 373 system as soon as early-2013 but this did not occur because of development issues. Operational-level service is now slated to begin sometime in 2017 - its battlefield effectiveness versus the original Russian design remains to be seen.
Update November 2015: The Russian and Iranian governments have re-entered into a contract to supply S-300 to Iran. The original contract for five S-300 units was suspended in 2010 (due to the ongoing U.N. embargo) to which the Iranian government then filed suit in 2011. The ban was lifted in early 2015 as relations between Iran and the West have thawed. The final S-300 will arrive in 2016.