Calling from one station in which call identification is sent to signal automatically one or more remote stations and to establish links among them. Note 1: Selective calling may be used to un-mute the speakers at designated stations or to initiate a handshake for link establishment. Note 2: Selective calling is specified in ITU-R Recommendations for HF and VHF/UHF radio, generally for ship-to-shore, ship-to-ship, aircraft-to-aircraft, and aircraft-to-ground communications.