Characters speaking with kbTell have no voice/ no sound unless there's a radio in their inventory. Remove the radio, the dialog text is visible and their lips move, but there's no sound even at direct face to face range. I discovered this because I need to implement the FSM dialog system with civilians, but most of them don't have radios. If I give them a radio, they can talk. The reverse applies too: remove the radio from a soldier, he no longer speaks.

For comparison, I tested this in Arma 2 and it works flawlessly.
I am using the kbTell command. Another user on the forums said he had tried it with the BIS_fnc_kbTell with the same results: no sound without a radio. {F26462}