During seasons that feature technology, treat the radio as realistically as possible. The radio, and whatever is broadcasted over it, must always be in character.
If you have met someone previously in RP and therefore know their voice, if makes sense that you would know who you’re speaking to even if they don’t state their name.
If you have not met someone in RP, if they don’t specifically state their name/tribe, all you know is their voice. When you finally meet, it is absolutely within RP to say, “Oh, you’re [Character Name]! I recognize your voice from the radio!”
Direct frequency radio RP, if needed, is allowed to be done via text and will be considered to be a “transmission”. You must explicitly state who you are in the “transmission” since players cannot use name/clan tags or your voice to determine who you are.
The radio should be used to facilitate RP (arranging a meet-up, checking if someone is awake, etc.) and NOT as your primary mode of RP.