Voiced pings would be an unneeded complication of one's life (scripting it) and totally useless game-wise.
Air player on Seton's Clutch does not need to hear voiced pings addressed to the front player by one of the navy players.
No need to invent a bike, in other games (maybe in not all) the smart pings are just a ping accompanied with specific information that remains on screen for some seconds.
Idea for a ping:
Hide your ACU, snipe possible.