The Iridium Extreme PTT provides Push-to-Talk, as well as voice and SMS services on the reliable Iridium network with global coverage. Iridium’s Push-to-Talk (PTT) service delivers global, real-time, interoperable group communications with the push of a button. Iridium PTT is simple to set up and adjust as your needs change. Using the Iridium PTT Command Center, you can define coverage areas and user talk-groups quickly and easily. As situations evolve, you are able to make changes on the fly that are carried out within seconds – it’s the ultimate in adaptability and responsiveness.