1) Communicator 2) One using gestures 3) Signaler 1) Ringer 2) Signaler 3) Signalman 4) Toller 
In the armed forces, a signaller or signaleer is a specialist soldier or seaman or airman responsible for military communications. Signallers, aka Combat Signallers or signalmen or women, are commonly employed as radio or telephone operators, relaying messages for field commanders at the front line (Army units, Ships or Aircraft), through a chain ...
The new term for a signalman