ICOM IC-SAT100 Push-To-Talk (PTT). About the ICOM IC-SAT100 Push-To-Talk (PTT). ICOM IC-SAT100 Push-To-Talk (PTT) uses the Iridium network to provide users coverage anywhere in the world. Even if terrestrial network infrastructure is rendered unusable by human or natural disasters, this Push-To-Talk can provide a stable backup, independent from other networks.
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